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KMID : 0353019690060020230
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Korean Journal of Public Health
1969 Volume.6 No. 2 p.230 ~ p.235
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A Study on Hookworm Reinfection
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Abstract
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This study was conducted to find out the status of hookworm reinfection in a rural area of Korea. The survey area was a rural area in Pocheon-gun(county). Kyunggi-do(Province), where the prevalence rate of hookworm infection was know as 48.5 percent in a survey as of May, 1967.
One of the groups of the subjects was 30 persons in number who had discharged
hookworm eggs in their feces and were treated successfully by using Bephenium
hydroxynaphthoate in May, 1967(negative after treatment). Another group as a control, was also 30 persons in number who did not discharge any hookworm eggs in their feces at that time and were known to not have had any experience of hookworm infection before(original negative). Both groups were sampled as to the distribution of sex and age which were almost the same.
In the examination of the feces of the groups in March, 1969, 1 year and 10 months later, the rates of hookworm infection of negative after treatment group and original negative group were 26.7% and 10.0% respectively, and an average of 18.3% for both.
All cases of hookworm infection in the groups were treated completely by using
Bephenium hydroxynaphthoate and all hookworms expelled through feces were collected by means of washing the feces which were discharged during the 3days after the treatment. The species of the hookworms were all Ancylostoma duodenale. Total number of hookworms expelled in negative after treatment group (8cases) were 104 or 13 per case and the numbers in original negative group(3cases) were 16 or 5 per case. For both groups the number of the worms per case were 11. From the above result, it may be considered that both the infection rate and intensity of negative after treatment group is higher than that of the original negative group.
Egg counts were also performed. But the variation of the count was so great by each case that the estimation of the hookworm load based on the egg count seemed to be difficult.
From this study the Author concludes that there seems that no protective immunity is developed by the hookworm (Ancylostoma duodenale) infection in human body, and the variance of the infection rate and intensity between both groups is considered to be due to the chance of infection.
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