Parasites, Hosts and Diseases

"egg laying capacity"

Brief Communication

Egg Laying Capacity of Haplorchis taichui (Digenea: Heterophyidae) in Humans: Megumi Sato, Surapol Sanguankiat, Somchit Pubampen, Teera Kusolsuk, Wanna Maipanich, Jitra Waikagul; Korean J Parasitol 2009;47(3):315-318.
Published online August 28, 2009; DOI: https://doi.org/10.3347/kjp.2009.47.3.315

Abstract
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Quantitative fecal egg counts represented as the number of eggs per gram of feces (EPG) are generally a reliable parameter to estimate the worm burden of intestinal and hepatic parasitoses. Although Haplorchis taichui (Digenea: Heterophyidae) is one of the most common minute human intestinal flukes, little is known about the relationship between EPG and the actual worm burden in patients or the severity of the disease. In the present study, fecal samples were collected from 25 villagers in northern Thailand before and after praziquantel treatment. The EPG values of each participant were determined by the modified cellophane thick smear method, and adult worms were collected from the whole stool after the treatment. Eggs per day per worm (EPDPW) of H. taichui were estimated 82 from egg counts and expelled worms. The EPG was not well correlated with the worm burden, and a reverse correlation was observed between the EPDPW and the worm burden.

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Original Article

Persistent endemicity of Gymnophalloides seoi infection in a southwestern coastal village of Korea with special reference to its egg laying capacity in the human host: Jong-Yil Chai, Geun Chan Lee, Yun-Kyu Park, Eun-Taek Han, Min Seo, Jin Kim, Sang-Mee Guk, Eun-Hee Shin, Min-Ho Choi, Soon-Hyung Lee; Korean J Parasitol 2000;38(2):51-57.
Published online June 30, 2000; DOI: https://doi.org/10.3347/kjp.2000.38.2.51

Abstract
PDF

Follow-up studies have been conducted every three years on the endemicity of Gymnophalloides seoi infection in a small coastal village of Chollanam-do (Province), Korea, since it was first known as an endemic area in 1994. Special attention was given to its egg laying capacity in the human host. In fecal examinations, the overall helminth egg and/or cyst positive rate was 78.7% (74/94) in 1997 and 76.6% (82/107) in 2000. Among them G. seoi eggs showed the highest rate; 71.3% (67/94) in 1997 and 72.0% (77/107) in 2000. The average number of eggs per gram of feces (EPG) was 1,015 in 1997, while a reduced rate of 353 was observed in 2000. In 1997, total of 320,677 adult flukes of G. seoi (av. 10,344/person, 94-69,125 in range) were collected from the diarrheic stools of 31 treated patients. The EPG/worm obtained from 21 cases ranged from 0.04 to 0.77 (av. 0.23), suggesting density-dependent constraints on the worm fecundity. The relationship between the worm burden (X) and EPG/worm (Y) can be expressed as Y=0.42 ·e^-1.2χ (r=0.49). The results showed that G. seoi infection is persistently endemic in this village.

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