Yong Suk Ryang

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Parvatrema chaii n. sp. (Digenea: Gymnophallidae) is described using the worms recovered from experimentally infected mice in Korea. The metacercariae were collected from surf-clams, Mactra veneriformis, from a tidal flat in Sochon-gun, Chungchongnam-do. The metacercariae were elliptical (0.262 x 0.132 mm), and the genital pore had an anterior arch of 16-17(More)
An epidemiological survey was performed to know the infection status of oysters with Gymnophalloides seoi metacercariae in 7 islands of the West Sea known as the habitat of paleartic oystercatchers, Haematopus ostralegus osculans, in Korea. The surveyed areas were Aphaedo (Shinan-gun, Chollanam-do), Jangjado, Sonyudo and Munyodo (Okdo-myon, Kunsan-shi,(More)
Mucosal mast cell (MMC) responses and worm recovery rates in rats infected with Echinostoma hortense were investigated from day 3 to day 56 post-infection (p.i.). Experimental infected group showed apparently higher number of MMC in each part of the small intestine than that of the control group. The number of MMC in the duodenum increased gradually after(More)
The present study was performed to know the epidemiological status of echinostomiasis in the Chungju Reservoir and upper streams of Namhan River, together with an experimental study on the life history of Echinostoma hortense. The stool specimens of 169 inhabitants and 473 junior high school students from 5 different villages revealed 3 (0.5%)(More)
Despite the increasing incidence in food-borne Echinostoma hortense infection, the underlying immune mechanism along with the clinical manifestations and the expulsion of the worms from the mucosal surfaces are not well understood. To clarify the differences in the immune mechanisms induced by E. hortense in the host, we examined the interleukin (IL)-4,(More)
In order to verify the role of migrating birds as natural definitive hosts for Gymnophalloides seoi (Gymnophallidae), Palearctic oystercatchers, Haematopus ostralegus, were caught from several western coastal areas in the Republic of Korea and examined for intestinal flukes. Five (71.4%) of 7 oystercatchers were infected with 302-1,660 (mean 892) adult G.(More)
Although Echinostoma hortense is one of the intestinal trematodes with a high infection rate in South Korea, the exact immune response against E. hortense infection has yet to be fully investigated. In the present study, we investigated differential susceptibilities in two different strains of micenamely, BALB/c (H-2d) and C3H/HeN (H-2k) mice. Likewise, we(More)
Two rare cases of human infection with parvum (dwarf) type of Diphyllobothrium latum [syn. D. parvum (Stephens, 1908)], were discovered in Korea. The first case was a 46-year old housewife, from whom a kind of pseudophyllidean tapeworm eggs was detected in the feces. She was treated with praziquantel and purged, and a complete strobila with scolex, 120 cm(More)
A survey of the infection rate of Enterobius vermicularis among students in 4 primary schools located in Gangwon-do (Province) was done from May to June 2001. Among the 398 examinees, 39 (9.8%) were infected with E. vermicularis demonstrated by the adhesive cellotape anal swab method. The infection rates ranged from 8.3% to 11.8% among the four schools. The(More)
Since the Gordius worm is a parasite of crickets and several arthropods, cases of humans infected with this worm have been rare and accidental. A Gordius worm was obtained from a three-year-old girl who consulted a local clinic in Gwangju, Kyunggi-do, Korea. She lived in a rural area, and had eaten an insect that looked like a cricket. She expelled the worm(More)