Abstract
In Ascaris lumbricoides infection, the faecal examination, undertaking for ova detection, is not always diagnostic. It is just because some of the infected cases has Ascaris worm(s) which do not produce eggs. In the present study, the authors attempted to analyse quantitatively the egg discharging patterns in Ascaris infected cases with low worm burden. The following results were obtained: In 1,861 Ascaris worms collected from 853 cases, the sex ratio was 1: 0.74 (female: male). Sex combinations in each burden of case were always fitted with theoretical values from the binomial distribution; (m+f)(n)= (0.426+0.574)(n). In each worm burden, their sex combination indicated different egg discharging patterns; false negative cases, unfertilized ova passers and fertilized ova passers. When the relative frequency of the above three egg discharging patterns was plotted to worm burden per case, a definite relationship was found. The cases with six or more worms have nil probability to be false negative case or unfertilized ova passer. Out of 853 cases, we found 129 false negative cases. The collected worms from 125 cases were morphologically analysed. It was found that 52% of them were infected with only male worm(s) and 24% were infected with young female worm(s). And in 8.8%, old female(s) with empty uterus were infected. The cause of 15.2% was remained unexplained, even though the collected worms were scrutinized.
Citations
Citations to this article as recorded by
- A mathematical model of helminth transmission dynamics under WASH program interventions
Gonzalo Maximiliano Lopez, Juan Pablo Aparicio
Nonlinear Analysis: Real World Applications.2026; 92: 104621. CrossRef - Mathematical Modeling of Mating Probability and Fertile Egg Production in Helminth Parasites
Gonzalo Maximiliano Lopez, Juan Pablo Aparicio
Bulletin of Mathematical Biology.2024;[Epub] CrossRef - What was the main factor in successful control of ascariasis in Korea?
Seung-Yull Cho, Sung-Tae Hong
Parasites, Hosts and Diseases.2023; 61(2): 103. CrossRef - What impact will the achievement of the current World Health Organisation targets for anthelmintic treatment coverage in children have on the intensity of soil transmitted helminth infections?
JE Truscott, HC Turner, RM Anderson
Parasites & Vectors.2015;[Epub] CrossRef - Epidemiology and control of ascariasis in Korea
B S Seo
The Korean Journal of Parasitology.1990; 28(Suppl): 49. CrossRef - Faecal egg counts and nematode fecundity: Heligmosomoides polygyrus and laboratory mice
A. E. Keymer, R. W. Hiorns
Parasitology.1986; 93(1): 189. CrossRef - The epidemiology and control of intestinal helminths in the Pulicat Lake region of Southern India. I. Study design and pre- and post-treatment observations on Ascaris lumbricoides infection
D.B. Elkins, M. Haswell-Elkins, R.M. Anderson
Transactions of the Royal Society of Tropical Medicine and Hygiene.1986; 80(5): 774. CrossRef - 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, Byong Seol Seo
The Korean Journal of Parasitology.1985; 23(2): 241. CrossRef - The detectability of helminth eggs from feces by cellophane thick smear technique
Jong Yil Chai, Young Tae Yang, Soon Hyung Lee, Byong Seol Seo
The Korean Journal of Parasitology.1982; 20(1): 14. CrossRef - Fluctuation of the egg production amounts according to worm burden and length of Ascaris lumbricoides
Jong Yil Chai, Sung Tae Hong, Soon Hyung Lee, Byong Seol Seo
The Korean Journal of Parasitology.1981; 19(1): 38. CrossRef - Effect of two-month interval mass chemotherapy on the reinfection of Ascaris lumbricoides in Korea
Byong seol Seo, Jong Yil Chai
The Korean Journal of Parasitology.1980; 18(2): 153. CrossRef - Frequency distribution of Ascaris lumbricoides in rural Koreans with special reference on the effect of changing endemicity
Byong Seol Seo, Seung Yull Cho, Jong Yil Chai
The Korean Journal of Parasitology.1979; 17(2): 105. CrossRef
