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Evidence of egg discharging periodicity in experimental human infection with diphyllobothrium latum


, : Evidence of egg discharging periodicity in experimental human infection with diphyllobothrium latum. Japanese Journal of Parasitology 35(1): 53-58

One of the authors was voluntarily infected with 6 plerocercoids of Diphyllobothroium latum (Linne, 1758) obtained from a pike, Esox lucius, in Finland on September 1, 1978. Since the first appearance of eggs in feces on day 16 postinfection, the stool examinations for eggs were continuously positive from 20 days onward. Although some cyclical fluctuation was observed in daily egg production, any negative phase, when no egg is discharged, has never been observed even after the spontaneous expulsion of a strobila (on Oct. 7, 1978) and removal of 3 strobilae by the first treatment (on Nov. 6, 1978) as well as one strobila by the second treatment (on Dec. 20, 1978). Since then no egg was found in the feces for at least 2 months, and the patient was thought to be completely cured. However, about 3 years and 10 months later (on Nov. 1, 1982), a strobila of about 1 m long was spontaneously expelled, suggesting still existence of 1 worm or 2 (less possibly). The periodic discharging of eggs was distinctly actualized as the results of the weekly stool examinations for eggs for about 2 years until the removal of worm due to the natural death (on Oct. 30, 1984). Four negative phases and four patent-periods were alternately observed at irregular intervals. This is the first demonstration of "egg-discharging periodicity" in Diphyllobothrium latum (Linne, 1758), suggesting the phenomenon of "strobilaperodicity", which has been known only in Spirometra as "the non-induced, endogenous periodic destrobilation, an extreme of pseudapolysis" by Odening, 1983.

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