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KMID : 0378019700130060045
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New Medical Journal
1970 Volume.13 No. 6 p.45 ~ p.52
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An Epidemiological Survey of 1969 Cholera Outbreaks in Some Areas of Korea
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權彛赫/Kwan, E Hyock
朴淳永/洪在雄/Park, Soon Young/Hong, Jae Woong
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Abstract
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An epidemiological survey was. conducted towards 187 cholera patients in total during the period from September 7 to 28, 1969. Geographically 34 cases were in Suchun Gun, Choongchung Nam Do; 2 in Gunsan City, 36 in Okku Gun, 55 in Kochang Gun and 60 in Buan Gun, Cholla Puk Do, respectively. Total number of patients´ households were 171 with 1,060 family members. For control group 870 households with 4,625 in population were examined; 114 households with 680 in population were in Suchun Gun, 119 with 617 in Gunsan City and 637 with 3,328 in Okku Gun. As the results of this study, following conclusions were obtained.
1. Route of entry
Basing on the fact that the causative agent was identified bacteriologically as non-hemolytic Elf Tor cholera vibrio as well as the existences of cholera epidemics caused by the vibrio of same strain in certain south-east Asian countries, it was conjectured that the recent cholera outbreaks were introduced to Korea through Gunsan where vessels from contaminated areas frequently had put into port prior to the outbreaks. In addition to this conjecture, the possibility of artificial invasion might be considered.
2. Characteristics of cholera patients
Age: Out of the total cases, 88.2% occurred among the age groups of more than 30 years and the mean age was 45. 5 years.
Sex: Proportion by sex was observed 2 in male to 1 in female.
Educational level: Among total cases, 90. 4% were of primary school level and no schooling.
Number of family member: Average number of family member of cholera patients was 6. 2, while that was 5. 3 in control group.
Newspaper and radio: Among patients 7. 1% read newpapers and 25. 0% possessed radios. 3. Status of patients at interview
It was observed that 39. 0% of total patients were under treatment, 49. 2% were recovered and 11. 8% were dead at the time of interview.
4. Status of treatment
Out of the total patients 55. 1% were treated at health centers, 23. 5% at private clinics and 21.4% at home, respectively. Mean days of treatment from onset to recovery was 4. 1 among recovered ratat cases.
Case fatality rate was 11.8% and 66.6% died within 24 hours after onset. Out of total fatal cases 56.6% were among the group not treated at all.
6. Food taken prior to onset.
Regarding the food taken within 3 days prior to onset, it was found that fish and shellfish occupied 40.1 % and pork (mainly at houses of mourning) 33.2%. Since the proportions of these food among control group were significantly lower, these food might be considered as main common vehicle.
7. Subjective symptom
Among the subjective symptoms complained by patients, severe diarrhea ranked first with 94.4% and vomiting next with 64.5%.
8. Secondary attack rate
In 6.8% of total households, 2 or more patients were observed in each household and the secondary attack rate was 1.8%.
9. Vaccination
Regarding cholera vaccination, 26.3% of total patients answered that vaccinated before onset. 10. Carrier rate Carrier rate was 1.6% among fisherman and 3.3% among patients´ family members.
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