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KMID : 0383919740110000117
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Report of National Institute of Health
1974 Volume.11 No. 0 p.117 ~ p.126
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The Epidemiological Pattern of Haemorrhagic Nephrosonephritis(Korean Haemorrhagic Fever) Cases In the Republic of Korea, 1974
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Abstract
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The analysis of 170 cases which occurred in the civilian population during 1974 revealed as follows,
1. Seasonal occurance;
While usually a :.-ew cases arise throughout the
year, an accumulation of cases can be
observed in May-June and October-Decemb r.~Above 70% of all the cases appeared during the three months of the winter peak (Table 1 and Table 3).
2. Distribution by Age and Sex;
From table 2 it can be seen that the disease appears to affect most frequently the age . group 2150 (68% of all cases). No cases were recorded in the older `age people above 70 years of age and only 2-cases (1%) were found in the youngest age group (0-10 years) Although cases occur in both sexes, the disease is.significantly more frequent in males than in females and males cases are more than twice the number of female cases.´
3. Geographical distribution;
Morbidity rates calculated for each county (Table 4) were plotted on the attached map and clearly indicate that KHF is spreading southward from its original endemic focus in the central area of the demilitarized zone (DMZ).
It is understood that the vast majority of cases´ occurred in rural areas and those cases which reported from city areas were residing in the semirural fringe area of the city.
4. ´ Discussion and Summary;
Cases appear throughout the year and have a wide distribution in the rural areas. The majority of KHF patients are persons engaged in agricultural activities or military personnel.
There are no indications that exposure to the causative agent takes place in close proximity to human habitations.-The. older, age groups (30-50) spend more time in the-fields-then either the younger (Less than thirty) or older (over fifty) groups.
Men are engaged in field activities more than women. It remains to be seen, however, just how closely the ratio of cases among females to males corresponds to the proportion of females to males that are engaged in work in the fields. `
Suggestions of person to person transmission do not exist.
The occurrence of more than one case in the same house is extremely rare. There also is
no information to implicate food, water, clothing in the transmission of KHF.
More detailed investigations of the patients histories is needed, Much more information on the general ecology of people, houses, villages, etc. can also be helpful. Increased surveillance may very well provide the answer to this question.
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