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Korean J Parasitol > Volume 23(2):1985 > Article

Original Article
Korean J Parasitol. 1985 Dec;23(2):241-246. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1985.23.2.241
Copyright © 1985 by The Korean Society for Parasitology
Prevalence, worm burden and other epidemiological parameters of Ascaris lumbricoides infection in rural communities in Korea
Jong Yil Chai,Koo Soo Kim,Sung Tae Hong,Soon Hyung Lee and Byong Seol Seo
Department of Parasitology and Institute of Endemic Diseases, College of Medicine, Seoul National University, Seoul 110, Korea.
Abstract

The epidemiological status of ascariasis was analyzed in 8 rural villages in Korea, through observation of its epidemiological parameters such as prevalence, worm burden and basic reproductive rate. Total 978 inhabitants were subjected to stool examination and recovery of worms after chemotherapy with pyrantel pamoate. The results were as follows: The worm positive rate in each village was 16.5-79.5%, while the egg positive rate was 9-18% lower, 3.3-66.7%. The average worm burden(among all inhabitants) ranged from 0.21 to 8.44 by villages and the frequency of cases with each worm burden showed negative binomial distributions with 'k' values of 0.38-0.54. The prevalence rates (worm) in each village was almost identical with the theoretical ones from Anderson and May's equation; p=1-(1+M(*)/k)**(-k), where 'p' is worm prevalence and 'M(*)' equilibrium average worm burden. The basic reproductive rate 'R' was calculated from 1.03 to 2.11. It is suggested that, although 'R' in lower endemic areas is approaching to the breakpoint of reinfection (R=1), control programs of ascariasis in Korea should be continued until it becomes below the level nationwidely.

Tables


Table 1
Studied areas and epidemiological indices for Ascaris lumbricoides infection


Table 2
Distribution of cases by worm burdens in each area


Table 3
Negative binomial* indices for the distribution of individual worm burdens of A. Lumbricoides


Table 4
Theoretical prevalence (worm) and basic reproductive rate (R) according to Anderson et May (1982)'s model

References
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3. Chai JY. Epidemiological Studies On Ascaris Lumbricoides Reinfection In Rural Communities In Korea: 1. The Relationship Between Prevalence And Monthly Reinfection Rate. Korean J Parasitol 1983;21(2):135–141.
 
4. Chai JY, Seo BS, Lee SH, Cho SY. Epidemiological Studies On Ascaris Lumbricoides Reinfection In Rural Communities In Korea II. Age-Specific Reinfection Rates And Familial Aggregation Of The Reinfected Cases. Korean J Parasitol 1983;21(2):142–149.
 
5. Croll NA, Anderson RM, Gyorkos TW, Ghadirian E. The population biology and control of Ascaris lumbricoides in a rural community in Iran. Trans R Soc Trop Med Hyg 1982;76(2):187–197.
  
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7. Seo BS, Cho SY, Chai JY. Egg Discharging Patterns Of Ascaris Lumbricoides In Low Worm Burden Cases. Korean J Parasitol 1979;17(2):98–104.
 
8. Seo BS, Cho SY, Chai JY. Frequency Distribution Of Ascaris Lumbricoides In Rural Koreans With Special Reference On The Effect Of Changing Endemicity. Korean J Parasitol 1979;17(2):105–113.
 
9. Yun CK, et al. Korean J Ped Assoc 1979;22(1):30–36.
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