Journal of Preventive Medicine and Public Health

Original Articles

Seroreactivity to Q Fever Among Slaughterhouse Workers in South Korea: Hyuk Chu, Seok-Ju Yoo, Kyu-Jam Hwang, Hyun-Sul Lim, Kwan Lee, Mi-Yeoun Park; J Prev Med Public Health. 2017;50(3):195-200. Published online May 11, 2017; DOI: https://doi.org/10.3961/jpmph.17.017

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Objectives
Q fever is a zoonotic disease that occurs worldwide; however, little is known about its prevalence in South Korea. We attempted to determine the prevalence of Q fever seroreactivity among Korean slaughterhouse workers and the risk factors for seroreactivity according to the type of work.
Methods
The study was conducted among 1503 workers at a total of 73 slaughterhouses and 62 residual-product disposal plants. During the study period, sites were visited and surveys were administered to employees involved in slaughterhouse work, and serological tests were performed on blood samples by indirect immunofluorescence assays. Serological samples were grouped by job classification into those of slaughter workers, residual-product handlers, inspectors and inspection assistants, and grading testers and testing assistants. Employee risk factors were analyzed according to the type of work.
Results
Out of 1481 study subjects who provided a blood sample, 151 (10.2%) showed reactive antibodies. When these results were analyzed in accordance with the type of work, the result of slaughter workers (11.3%) was similar to the result of residual-product handlers (11.4%), and the result of inspectors and assistants (5.3%) was similar to the result of grading testers and assistants (5.4%). Among those who answered in the affirmative to the survey question, “Has there been frequent contact between cattle blood and your mouth while working?” the proportions were 13.4 and 4.6%, respectively, and this was identified as a risk factor that significantly varied between job categories among slaughterhouse workers.
Conclusions
This study found a Q fever seroreactivity rate of 10.2% for slaughterhouse workers, who are known to be a high-risk population. Contact with cattle blood around the mouth while working was the differential risk factor between job categories among slaughterhouse workers.

Summary

Citations

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Prevalence and risk factors associated with Q fever infection in slaughterhouse workers in Fars province, Iran
Alireza Zakeri, Maryam Montaseri, Seyed Shahram Shekarforoush
International Archives of Occupational and Environmental Health.2023; 96(4): 597. CrossRef
First report of an outbreak of “Q” fever IN an abattoir from Argentina
Natalia Marina Cardillo, Reginaldo Bastos, Araceli García, Rosendo Pérez, Ezequiel García, Susana Lloveras, Carlos Suarez
Zoonoses and Public Health.2023; 70(8): 674. CrossRef
Seroepidemiologic evidence of Q fever and associated factors among workers in veterinary service laboratory in South Korea
Dilaram Acharya, Ji-Hyuk Park, Jeong-Hoon Chun, Mi Yeon Kim, Seok-Ju Yoo, Antoine Lewin, Kwan Lee, José Reck
PLOS Neglected Tropical Diseases.2022; 16(2): e0010054. CrossRef
Exposure of South African Abattoir Workers to Coxiella burnetii
Liesl De Boni, Sumaya Mall, Veerle Msimang, Alex de Voux, Jennifer Rossouw, John Frean
Tropical Medicine and Infectious Disease.2022; 7(2): 28. CrossRef
Seroprevalence of Coxiella burnetii in a dairy cattle herd from the Al Ain region, United Arab Emirates
Robert Barigye, Nabeeha Abdelgaleel D. Hassan, Ibrahim M. Abdalla Alfaki, Mike B. Barongo, Mohamed Elfatih H. Mohamed, Khaja Mohteshamuddin
Tropical Animal Health and Production.2021;[Epub] CrossRef
Seroreactivity to Coxiella burnetii in an Agricultural Population and Prevalence of Coxiella burnetii Infection in Ticks of a Non-Endemic Region for Q Fever in South Korea
Jeong-Rae Yoo, Mi-Sun Kim, Sang-Taek Heo, Hyun-Joo Oh, Jung-Hwan Oh, Seo-Young Ko, Jeong-Ho Kang, Sung-Kgun Lee, Woo-Seong Jeong, Gil-Myeong Seong, Hyun-Jung Lee, Chul-Hoo Kang, Ji-Hyun Moon, Keun-Hwa Lee, Sung-Wook Song
Pathogens.2021; 10(10): 1337. CrossRef
Isolation of Coxiella burnetii in patients with nonspecific febrile illness in South Korea
Seung Hun Lee, Jae Hoon Lee, Sungdo Park, Hae Kyung Lee, Seon Do Hwang, Hye Won Jeong, Jung Yeon Heo, Yeong Seon Lee
BMC Infectious Diseases.2020;[Epub] CrossRef
Coxiella burnetiiinfection in humans: to what extent do cattle in infected areas free from small ruminants play a role?
M. Pouquet, N. Bareille, R. Guatteo, L. Moret, F. Beaudeau
Epidemiology and Infection.2020;[Epub] CrossRef
Hepatitis in slaughterhouse workers
Hassan Tariq, Muhammad Umar Kamal, Jasbir Makker, Sara Azam, Usman Ali Pirzada, Vaniza Mehak, Kishore Kumar, Harish Patel
World Journal of Hepatology.2019; 11(1): 37. CrossRef
Clinical characteristics of acute Q fever patients in South Korea and time from symptom onset to serologic diagnosis
Jung Yeon Heo, Young Wha Choi, Eun Jin Kim, Seung Hun Lee, Seung Kwan Lim, Seon Do Hwang, Ju Young Lee, Hye Won Jeong
BMC Infectious Diseases.2019;[Epub] CrossRef
Serologic Survey and Risk Factors forCoxiella burnetiiInfection among Dairy Cattle Farmers in Korea
Ji-Hyuk Park, Hyuk Chu, Seok-Ju Yoo, Kyu-Jam Hwang, Hyun-Sul Lim
Journal of Korean Medical Science.2018;[Epub] CrossRef
Seroreactivity and Risk Factors Associated with Coxiella burnetii Infection among Cattle Slaughterhouse Workers in South Korea
Ji-Hyuk Park, Seon Hwang, Dilaram Acharya, Seung Lee, Kyu Hwang, Seok-Ju Yoo, Kwan Lee
International Journal of Environmental Research and Public Health.2018; 15(10): 2264. CrossRef

A Survey on the Status of Hepatitis E Virus Infection Among Slaughterhouse Workers in South Korea: Byung-Seok Kim, Hyun-Sul Lim, Kwan Lee, Young-Sun Min, Young-Sil Yoon, Hye-Sook Jeong; J Prev Med Public Health. 2015;48(1):53-61. Published online January 15, 2015; DOI: https://doi.org/10.3961/jpmph.14.048

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Abstract PDF

Objectives
The seroprevalence of hepatitis E virus (HEV) among high-risk groups overseas is high, but studies in these groups are rare in South Korea. We conducted the present study from April to November 2012 to obtain data on the seroprevalence and associated risk factors for HEV among slaughterhouse workers in South Korea.
Methods
Slaughterhouse workers from 80 workplaces nationwide were surveyed in South Korea in 2012. The subjects comprised 1848 cases: 1434 slaughter workers and 414 residual products handlers. By visiting 80 slaughterhouses, which were mixed with 75 of which also performed residual products handling, we conducted a questionnaire survey for risk factors and obtained blood samples in order to determine the seropositivity and seroprevalence of HEV. Anti-HEV IgG and IgM were measured using HEV IgG and IgM enzyme-linked immunospecific assay kits and HEV antigen was measured by reverse transcription polymerase chain reaction (RT-PCR).
Results
The seropositivity of anti-HEV IgG was 33.5% (slaughter workers 32.8% and residual products handlers 36.2%), and among the seropositive individuals the seroprevalence of anti-HEV IgM was 0.5% (slaughter workers 0.5%, residual products handlers 0.7%). The response rate of HEV-antigen as measured by RT-PCR was 0.2%. Risk factors significantly related to anti-HEV IgG seropositivity were age, sex , and working duration (slaughter workers only).
Conclusions
There were significant risk factors (sex, age, and working duration) for HEV identified in our study. All three positive cases for HEV-antigen by RT-PCR were related to pig slaughter but without statistical significance. To prevent HEV, an educational program and working guidelines may be needed for high risk groups.

Summary

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Epidemiological Aspects of Hepatitis E Virus Infections between South Korea and Japan
Myeong-Jin Lee, Won-Chang Lee, Young Hwan Kwon
The Korean Journal of Aerospace and Environmental Medicine.2022; 32(1): 27. CrossRef
Hepatitis E virus in professionally exposed: A reason for concern?
Anna Mrzljak, Ivan Balen, Ljubo Barbic, Maja Ilic, Tatjana Vilibic-Cavlek
World Journal of Hepatology.2021; 13(7): 723. CrossRef

Analysis of the Change of Health Status Among the Republic of Korea Air Force Soldiers During Military Service: Seok-Ju Yoo, Won-Ju Park, Kwan Lee, Hyun-Sul Lim, Hyun-Jin Kim, Suk-Ho Lee; J Prev Med Public Health. 2014;47(4):230-235. Published online July 31, 2014; DOI: https://doi.org/10.3961/jpmph.2014.47.4.230

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Objectives
The aim of this study was to investigate whether the health status of Republic of Korea Air Force (ROKAF) soldiers changed after one year of military service. Methods: We selected 483 ROKAF soldiers from the 11 749 recruits who participated in the 2011 physical examination. The selected soldiers underwent another physical examination in 2012 for advancement to senior airman. Data from 2011 and 2012 were merged. To collect data on lifestyle, a questionnaire was sent to all included subjects via the military intranet e-mail service. Results: The percentage of recruits with an abnormal alanine transaminase level (normal range <40 IU/L) decreased from recruitment (13.7%) to the following year (2.7%). Moreover, the percentage of obese soldiers (body mass index ≥25 kg/m2) decreased from recruitment (20.5%) to the following year (10.4%). There was a significant change in mean duration of exercise carried out each day before (0.8±1.3 hours) and after (1.0±0.7 hours) joining the ROKAF service. Conclusions: These ROKAF soldiers were generally in good health before and after joining the armed service. After one year of military service, the health status of most soldiers improved, especially with respect to body mass index and alanine transaminase level.

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Yong Zhi Khow, Talia Li Yin Lim, Jarret Shoon Phing Ng, Jiaxuan Wu, Chuen Seng Tan, Kee Seng Chia, Nan Luo, Wei Jie Seow
BMC Public Health.2021;[Epub] CrossRef
Strategic Priorities to Improve Effectiveness of Anti-smoking Interventions for the Korean Military: An Application of the Analytic Hierarchy Process
Yun-Kyoung Song, Jae Hyun Kim, Boyoon Choi, Nayoung Han, Myeong Gyu Kim, Jeongsam Lee, Handuk Lee, Jieun Yoon, Beom-Jin Lee, Jung Mi Oh
Military Medicine.2018; 183(7-8): e223. CrossRef

Brief Report

Epidemiological Investigation of an Outbreak of Salmonellosis in Gyeongju, Korea: Seok-Ju Yoo, Hyun-Sul Lim, Kwan Lee; J Prev Med Public Health. 2014;47(3):177-181. Published online May 30, 2014; DOI: https://doi.org/10.3961/jpmph.2014.47.3.177

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Abstract PDF

Objectives

A salmonellosis outbreak occurred within a community of Gyeongju residents who ingested catered food from a wedding in June 2009. We aimed to epidemiologically investigate the probable vehicle of the infection.

Methods

We conducted a retrospective cohort study on 34 local residents who ingested the wedding food.

Results

Among the 34 residents, 31 (91.2%) reported symptoms of infection after eating the food. Among all of the wedding foods, pan-fried foods were highly associated with the diarrheal attack rate. On bacteriological examination, Salmonella species were detected in the pan-fried foods among the leftover foods and in 17 of the 31 stool specimens from the cases. There were five different types of pan-fried foods, but the onset of symptoms was independent of the ingredients used. We found that the pan-fried food was prepared at a food store in Seoul and that eggs were a common ingredient.

Conclusions

The major cause of the salmonellosis in this population was presumed to be the pan-fried food prepared with contaminated eggs. These food items might have been partially undercooked because of their irregular shape, which allowed the Salmonella species to survive and multiply before ingestion.

Summary

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International Journal of Food Microbiology.2020; 335: 108893. CrossRef
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Original Article

Airborne Nicotine Concentrations in the Workplaces of Tobacco Farmers: Seok-Ju Yoo, Sung-Jun Park, Byoung-Seok Kim, Kwan Lee, Hyun-Sul Lim, Jik-Su Kim, In-Shik Kim; J Prev Med Public Health. 2014;47(3):144-149. Published online May 30, 2014; DOI: https://doi.org/10.3961/jpmph.2014.47.3.144

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Abstract PDF

Objectives

Nicotine is a natural alkaloid and insecticide in tobacco leaves. Green tobacco sickness (GTS) is known as a disease of acute nicotine intoxication among tobacco farmers. Until now, GTS has been recognized globally as a disease that results from nicotine absorption through the skin. However, we assumed that GTS might also result from nicotine inhalation as well as absorption. We aimed to measure the airborne nicotine concentrations in various work environments of Korean tobacco farmers.

Methods

We measured the nicotine concentrations in the tobacco fields, private curing barns, and joint curing barns of farmers from July to October 2010. All sampling and analyses of airborne nicotine were conducted according to the National Institute for Occupational Safety and Health manual of analytic methods.

Results

The airborne nicotine concentrations (geometric mean [geometric standard deviation]) in the tobacco field were 83.4 mg/m³ (1.2) in the upper region and 93.3 mg/m³ (1.2) in the lower region. In addition, the nicotine concentration by personal sampling was 150.1 mg/m³. Similarly, the nicotine concentrations in the private curing barn, workers in curing barns, the front yard of the curing barn, and in the joint curing barn were 323.7 mg/m³ (2.0), 121.0 mg/m³ (1.5), 73.7 mg/m³ (1.7), and 610.3 mg/m³ (1.0), respectively.

Conclusions

The nicotine concentration in the workplaces of tobacco farmers was very high. Future studies should measure the environmental concentration of nicotine that is inhaled by tobacco farmers.

Summary

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English Abstract

Epidemiological Investigation for Outbreak of Food Poisoning Caused by Bacillus cereus Among the Workers at a Local Company in 2010.: Kum Bal Choi, Hyun Sul Lim, Kwan Lee, Gyoung Yim Ha, Kwang Hyun Jung, Chang Kyu Sohn; J Prev Med Public Health. 2011;44(2):65-73.; DOI: https://doi.org/10.3961/jpmph.2011.44.2.65

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OBJECTIVES
In July 2 2010, a diarrhea outbreak occurred among the workers in a company in Gyeungju city, Korea. An epidemiological investigation was performed to clarify the cause and transmission route of the outbreak. METHODS: We conducted a questionnaire survey among 193 persons, and we examined 21 rectal swabs and 6 environmental specimens. We also delegated the Daegu Bukgu public health center to examine 3 food service employees and 5 environmental specimens from the P buffet which served a buffet on June 30. The patient case was defined as a worker of L Corporation and who participated in the company meal service and who had diarrhea more than one time. We also collected the underground water filter of the company on July 23. RESULTS: The attack rate of diarrhea among the employees was 20.3%. The epidemic curve showed that a single exposure peaked on July 1. The relative risk of attendance and non-attendance by date was highest for the lunch of June 30 (35.62; 95% CI, 2.25 to 574.79). There was no specific food that was statistically regarded as the source of the outbreak. Bacillus cereus was cultured from two of the rectal swabs, two of the preserved foods and the underground water filter. We thought the exposure date was lunch of June 30 according the latency period of B. cereus. CONCLUSIONS: We concluded the route of transmission was infection of dishes, spoons and chopsticks in the lunch buffet of June 30 by the underground water. At the lunch buffet, 50 dishes, 40 spoons, and chopsticks were served as cleaned and wiped with a dishcloth. We thought the underground water contaminated the dishes, spoons, chopsticks and the dishcloth. Those contaminated materials became the cause of this outbreak.

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Original Article

Work-Related Musculoskeletal Symptoms Among Dairy Farmers in Gyeonggi Province, Korea.: Ji Hyuk Park, Hyun Sul Lim, Kwan Lee; J Prev Med Public Health. 2010;43(3):205-212.; DOI: https://doi.org/10.3961/jpmph.2010.43.3.205

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Abstract PDF

OBJECTIVES
The prevalence of work-related musculoskeletal symptoms (WMS) among Korean dairy farmers has not been investigated. The purpose of this study was to assess the prevalence of WMS and to evaluate the relationship between WMS and risk factors. METHODS: Self-developed questionnaires including the questionnaire developed by the Korean Occupational Safety and Health agency (KOSHA) were used to investigate WMS among dairy farmers in Gyeonggi Province, Korea. We informed selected dairy farmers about the study and sent the questionnaires by registered mail. They visited a public health center nearby or a branch of public health center on the appointed date and skillful researchers identified or conducted the questionnaires by interview. We analyzed 598 (32.8%) of the 1824 dairy farmers. Multiple logistic regression was implemented to estimate the odds ratios of risk factors. RESULTS: The mean age of the respondents was 50.4 +/- 8.7 years and the proportion of males was 63.0%. The prevalence of WMS at any site was 33.3%. The prevalence of neck WMS was 2.2%, shoulders 10.0%, arms/elbows 5.0%, hands/wrists/fingers 4.2%, low back 11.5%, and legs/feet 11.7%. The adjusted odds ratio of low back WMS for milking 4 or more hours per day was 4.231 (95% CI = 1.124 - 15.932) and statistically significant. Low back WMS (2.827, 95% CI = 1.545 - 5.174) was significantly decreased by education. CONCLUSIONS: Low back WMS increased with milking hours and milking 4 or more hours per day was significantly associated with low back WMS. Low back WMS was significantly reduced with education. We hope that there will be increased attention about WMS in dairy farmers and the subject of future investigations.

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English Abstracts

Seroprevalence and Risk Factors of Brucellosis among Slaughterhouse Workers in Korea.: Seok Ju Yoo, Young Sill Choi, Hyun Sul Lim, Kwan Lee, Mi Yeoun Park, Chaeshin Chu, Young A Kang; J Prev Med Public Health. 2009;42(4):237-242.; DOI: https://doi.org/10.3961/jpmph.2009.42.4.237

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Abstract PDF

OBJECTIVES
The incidence of zoonoses in Korea has increased recently. However, the study of high risk groups for zoonoses has not been conducted to date in Korea. Thus, we did this study to obtain data on brucellosis among slaughterhouse workers in Korea. METHODS: We evaluated the structure of slaughterhouses and the process of slaughtering by reviewing the relevant literature and doing field studies. We visited 73 slaughterhouses and 62 residual products handle houses across the country. In addition, we conducted a questionnaire survey of the work activities, and obtained blood samples in order to determine the seroprevalence and risk factors of brucellosis. The titers of brucellosis antibodies were measured using the standard tube agglutination test (SAT). We diagnosed subjects as seropositive for Brucellosis if the titers were more than 1:160. The data collected was evaluated using SPSS ver. 17.0. RESULTS: We included 1,503 subjects and obtained 1,482 blood samples among them: 849 workers involved in slaughtering, 351 handlers of residual products, 190 inspectors and their assistants, and 92 grading testers and their assistants. The seroprevalence of brucellosis among the slaughterhouse workers was 0.8% (95% CI=0.4-1.5). Broken down, the seroprevalence of brucellosis among the workers involved in slaughtering was 0.7% (95% CI=0.3-1.6), the handlers of residual products was 1.7% (95% CI=0.7-3.9) respectively. Risk factors for contracting brucellosis among slaughterhouse workers were being splashed with cattle blood around the mouth, cattle secretions around the body and not putting on protective apron while at work. CONCLUSIONS: An educational program is needed for high risk groups on zoonoses about the prevention of infection. Thus, effective working guidelines for workers who participate in the slaughter of animals must be developed in order to protect them from zoonoses.

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Seroprevalence of Brucellosis among Risk Population in Gyeongsangbuk-do, 2006.: Kwan Lee, Hyun Sul Lim, Woo Won Park, Sung Hwan Kim, Do Young Lee, Mi Yeoun Park, Youngju Hur; J Prev Med Public Health. 2007;40(4):285-290.; DOI: https://doi.org/10.3961/jpmph.2007.40.4.285

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Abstract PDF

OBJECTIVES
Cases of human brucellosis in Korea have recently increased due to the increasing incidence of bovine brucellosis. The authors conducted this study to elucidate the status of brucellosis through seroepidemiologic study. METHODS: We selected our study population from a high risk group. We conducted a questionnaire survey and obtained blood samples to determine the seroprevalence of brucellosis antibodies for 10 days in February, 2005. The titers of brucellosis were measured by the combination of standard tube agglutination test (STA) and enzyme-linked immunosorbent assay (ELISA) test. RESULTS: Our study subjects comprised 1,075 cases: 971 livestock workers, 51 veterinarians, and 53 artificial inseminators. In the STA test, 27 cases (2.5%) had titers of greater than or equal to 1:20. Of 1,068 cases (7 cases were excluded due to previous brucellosis), 7 cases of brucellosis were diagnosed with titers of 1:160, giving a seroprevalence of brucellosis of 0.66%. The seroprevalence in the male group was 0.95%, and that of livestock workers, veterinarians, and artificial inseminators was 0.52%, 4.17%, and 0.00%, respectively. The Spearman's correlation coefficient between the positive rate of bovine brucellosis per capita and household and human brucellosis was 0.806 and 0.744, respectively. The concordance rate between the Korea National Institute of Health and the Gyeongsangbuk-do Institute of Health and Environment by the STA and ELISA tests was 94.7% and 100.0%, respectively. CONCLUSIONS: The study results indicated in higher seroprevalence rate among veterinarians than among livestock workers and artificial inseminators. Because veterinarians may be exposed to this high risk, effective working guidelines for veterinarians to guard against brucellosis must be developed. Moreover, more extensive epidemiologic research for laboratory workers and meat handlers is needed.

Summary

Citations

Citations to this article as recorded by

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Journal of agricultural medicine and community health.2010; 35(4): 339. CrossRef
Seroprevalence and Risk Factors of Brucellosis among Slaughterhouse Workers in Korea
Seok-Ju Yoo, Young-Sill Choi, Hyun-Sul Lim, Kwan Lee, Mi Yeoun Park, Chaeshin Chu, Young-A Kang
Journal of Preventive Medicine and Public Health.2009; 42(4): 237. CrossRef
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Journal of agricultural medicine and community health.2009; 34(1): 1. CrossRef
Awareness of Zoonoses among Cattle Slaughterhouse Workers in Korea
Hyun-Sul Lim, Seok-Ju Yoo, Kwan Lee
Journal of agricultural medicine and community health.2009; 34(1): 101. CrossRef
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Original Articles

Prevalence and Risk Factors of Green Tobacco Sickness among Korean Tobacco Harvesters.: Hyun Sul Lim, Kwan Lee, Si Hyun Nam; J Prev Med Public Health. 2004;37(1):37-43.

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Abstract PDF: OBJECTIVE
This study was carried out to understand the prevalence and risk factors of green tobacco sickness (GTS) among Korean tobacco harvesters. METHODS: The authors conducted a questionnaire among the tobacco harvesters (1, 064 persons from 555 out of 723 tobacco harvesting households) in Cheongsong-gun for 4 days from May 7 to 10, 2002. RESULTS: The study subjects were 550 males and 514 females. The recognition and experience of GTS up until 2001 were 96.4% and 61.9%, respectively. The prevalence of GTS in 2001 was 42.5%, and was significantly higher in females than in males (59.0% vs. 26.6%, p< 0.01). The incidence density of GTS according to the number of workdays in 2001 was 12.3 spells/100 person' days. The GTS symptoms reported by the tobacco harvesters in 2001 were dizziness in 441 cases (97.6%), nausea in 414 (91.6%), headache in 349 (77.2%) and vomiting in 343 (75.9%). The use of gloves, hat and wristlets, sweating at work and the number of working hours significantly increased the prevalence of GTS (p< 0.05). Multiple logistic regression analysis was used to determine the factors significantly associated with GTS. Odds ratios for smoking, working over 10 hours and sweating at work were 0.26 (95% CI: 0.19-0.35), 1.64 (95% CI: 1.26-2.14) and 1.60 (95% CI: 1.14-2.25), respectively. Of those who reported GTS in 2001, 311 cases (68.8%) underwent treatment from their local medical facilities. CONCLUSION: In Korea, there are many tobaccoharvesting households, and most may be stricken with GTS. More extensive epidemiological studies, including heincidence and associated risk factors, are expected and a surveillance system including measurements of cotinine in urine should be conducted.; Summary

Survey on the Symptoms Related to Hair Dyeing among University Freshmen.: Kwan Lee, Hyun Sul Lim; Korean J Prev Med. 2003;36(3):223-229.

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Abstract PDF: OBJECTIVES
This study was carried out to investigate the prevalence and symptoms related to hair dyeing among university freshmen. METHODS: The authors conducted a questionnaire survey among 1, 499 university freshmen from Mar 11 to 15, 2002. RESULTS: The study group contained 710 females and 789 males. Up until 2002, 62.7% of the subjects had experienced hair dyeing, and this was significantly higher in females (66.2%, p< 0.05). The period of first experience of hair dyeing was in high school for 361 cases (38.4%), after high school for 345 cases (36.7%) and before high school for 234 cases (24.9%). The major reasons of hair dyeing were 'to improve their appearance' in 466 cases (49.6%), and 'to follow the hair dyeing fashion' in 169 cases (18.0%). The prevalence of hair dyeing in 2002 was 47.8%, and again was significantly higher in females (53.7%, p< 0.05). The major symptoms related to hair dyeing were 'cleaved and nonelastic hair' in 498 cases (69.6%), and 'thin and easily breakable hair' in 353 cases (49.3%). Of those, 361 cases (50.4%) appealed to three or more symptoms related to hair dyeing. Through multiple logistic regression, factors significantly associated with symptoms related to hair dyeing were found to be female (OR=2.14, 95% CI; 1.61-2.83), use of hair dryer (OR=1.36, 95% CI; 1.004-1.854), a frequency of hair dyeing of three or more (OR=1.48, 95% CI; 1.04-2.09), and a duration of processing hair dyeing of over 60 minutes (OR=2.18, 95% CI; 1.50-3.18). CONCLUSIONS: The prevalence and experience of hair dyeing were generally high among university freshmen. Therefore, more extensive epidemiological studies on the symptoms related to hair dyeing should be conducted.; Summary

Epidemiologic Investigation on an Outbreak of Cholera in Gyeongsangbuk-do, Korea, 2001.: Jun Ho Lee, Hyun Sul Lim, Kwan Lee, Jun Chul Kim, Sang Won Lee, Un Yeong Go, Byung Kuk Yang, Jong Koo Lee, Moon Sik Kim; Korean J Prev Med. 2002;35(4):295-304.

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Abstract PDF: OBJECTIVES
This study was carried out to investigate the cause, magnitude and transmission route of the cholera outbreak in 2001. METHODS: The study population were those persons who ingested foods at the restaurant, were confirmed as cholera patients, had symptoms of diarrhea and served as workers at the restaurant. A questionnaire survey and microbiological examinations on the microbes isolated from rectal swabs were conducted. Of the cases, 316 food histories were surveyed by an analysis of the restaurant menu. RESUJLTS: There were 139 confirmed cases of cholera reported in Korea in 2001. Of these, 104 were related to the restaurant. By region, Gyeongsangbuk-do had the highest incidence with 91 cases. Of these 91 cases, 74 had ingested foods at the restaurant, 2 were employees and 3 were secondary infection cases within the families. The results of the odds ratio analysis of the 316 persons having ingested foods at the restaurant were as follows: sandwiches 5.07 (95% CI, 1.85-14.59), soybean curd 2.45 (95% CI, 1.09-5.56), noodles 2.34 (95% CI, 1.24-4.42), steamed squid 2.01 (95% CI, 1.17-3.47) and vinegared rice 1.82 (95% CI, 1.08-3.09). It was certain the restaurant in question was the cause of the 2001 outbreak. CONCLUSIONS: We suspected that more than one restaurant employee contaminated foods served at the restaurant. In addition, eating raw fishes purchased at the Pohang Fisheries infected the employees of the restaurant. There is a possibility that these raw fishes were themselves contaminated by cholera bacilli in the sea.; Summary

Physical Fitness, Leisure Time Physical Activity, and Serum Lipid Levels in Middle-Aged Male Workers .: Jang Rak Kim, Bock Dong Nam, Ju Ho Kim, Song Kwan Lee, Joong Kap Moon, Jang Ho Lee, Dae Yong Hong; Korean J Prev Med. 1996;29(2):173-186.

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Abstract PDF: This is a cross-sectional study to evaluate the relationships between physical fitness, leisure time physical activity, and serum lipid levels in middle-aged male workers. Physical fitness was measured by a step test score, and leisure time physical activity was self-reported on a questionnaire. Serum total cholesterol was negatively related to physical fitness(r=-0.27), and positively to obesity index(r=0.27). But leisure time physical activity was related to total cholesterol negatively(r.-0.20) only in subjects whose total cholesterol levels were above 170mg/dl. High density lipoprotein(HDL) cholesterol was positively related to physical faintness(r=0.15), negatively to obesity index(r=-0.22), and positively to weekly alcohol consumption(r=0.14). Total cholesterol/HDL cholesterol ratio was related to physical fitness(r=-0.23), obesity index(r=0.32), total cigarette index (r=0.13), weekly alcohol consumption(r=-0.13), and vegetable preference(r=0.13) physical fitness was also related to leisure time physical activity(r=0.19) and obesity index(r=-0.18). In multiple linear regression models, physical fitness(beta= -0.23) and obesity index(beta=0.18) were significantly associated with total cholesterol, obesity index(beta=-0.25) with HDL cholesterol, and obesity index(beta=0.30), physical fitness(beta= -0.16) and vegetable preference (beta=0.14) with total cholesterol HDL cholesterol ratio. In conclusion, as physical fitness has a stronger relationship with serum lipid levels than leisure time physical activity, and the association between physical fitness and leisure time physical activity is modest, physical fitness should be added as an important variable in addition to activity in future epidemiologic studies.; Summary

Leukocyte count and hypertension in the health screening data in some rural and urban residents.: Choong Won Lee, Nung Ki Yoon, Sung Kwan Lee; Korean J Prev Med. 1991;24(3):363-372.

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Abstract PDF: We used the health screening data of some rural and urban residents to examine the cross-sectional association between leukocyte count and hypertension. The 206 male and 203 female rural residents were selected by multi-stage cluster sampling method in Kyungsan-Kun area of Kyungbuk province in 1985 and 600 urban residents were selected by the same sampling method as the rural residents in Daegu city of the same province in 1986 compatible with age-sex distribution of Daegu city of 1985 census, but of whom 384 actually responded. The rest of 600 were replaced by age and sex with those who were members of the medical insurance plan visiting the health management department of the university hospital to get the biannual preventive medical checkups. Excluded in the analysis were those having hypertensive history, diseases and extreme outlying values of the screening tests, leaving 373 rural and 571 urban residents. Leukocyte count was measured with ELT-8 Laser shadow method and the unit cells/mm3. Blood pressures were determined with an aneroid sphygmomanometer with pre-standardized method and hypertensives were defined as those showing systolic blood pressure more than 140 mmHg and / or diastolic blood pressure more than 90 mmHg. Total residents pooled (N=944) showed a significant difference between hypertensives and normotensives (6965.93+/-1997.01 vs 6490.61+/-1941.32, P=0.00) and in rural residents was noted the similar significant difference (P=0.03). None of significant differences were noted in any stratum stratified by residency and sex. Compared to the lowest quintile of WBC, 2/5 quintile showed odds ratio 0.99 (95% CI 0.90-2.21), 4/5 quintile 1.76 (95% CI 1.14-2.72), and highest quintile 1.80 (1.15-2.82) in the total residents. Likelihood ratio test for linear trend for in indicated a significant trend (x2 trend=5.53, df=1, P<0.05). There were no other significant odds ratios compared to the lowest quintile of WBC in strata stratified by residency and sex. The odds ratios in total residents which had showed significant odds ratios became nonsignificant and of reduced magnitude after controlling age, frequency of smoking and drinking with multiple logistic regression. In each stratum, it changed magnitudes of odds ratios slightly and unstably. None of the trend tests showed any significant trend. These results suggest that the Friedman et al's finding of association between leukocyte count and hypertension may be due to an statistical type I error result in from the data dredging in an exploratory study, in which more than 800 variables were screened as possible predictors of hypertension.; Summary

The Relationship of Psychosocial Factors to Blood Pressure.: Choong Won Lee, Sung Kwan Lee; Korean J Prev Med. 1988;21(1):99-112.

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Abstract PDF: Questionnaires and blood pressure measurements were administered to 279 medical school undergraduates in 1987 to investigate the relationship between psychosocial factors and blood pressure as well as reliability and validity of the Framingham Type A Behavior Scale(FTA). The reliability coefficients of SCL-90-R and FTA measured by Spearman-Brown haves split test were 0.57-0.91, The factors of FTA extracted by principal component analysis were hard-driving competitiveness factor and impatience factor(2-factor solution). The total score of FTA was positively correlated with relative weight and place raised but the correlations were insignificant, and had significantly positive but weak correlations with depression, anxiety hostility, paranoid, and psychoticism subscales of SCL-90-R. In the univariate analysis of blood pressures, relative weight and family history were significant in systolic pressure in males and economic status was significant in blood pressures in both sexes. For diastolic pressure, relative weight and frequency of alcohol intake were significant in males and relative weight was in females. After controlling relative weight, the frequency of alcohol intake for diastolic pressure and economic status for systolic pressure were significant in males. The important variables selected by stepwise regression analysis were relative weight and economic status for systolic pressure of males and relative weight and the frequency of alcohol to the model, changing coefficient of determination 0.206 to 0.217. In females, economic status and relative weight were selected for systolic pressure and for diastolic pressure body mass index alone, but the model of blood pressure for females was considered to be unstable due to small sample size(56). FTA was unrelated to the blood pressures in both sexes.; Summary

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