Japanese Journal of Veterinary Research;Volume 34, Number 2

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INFECTIVITY IN RODENTS AND COLD RESISTANCE OF TRICHINELLA SPIRALIS ISOLATAED FROM PIG AND POLAR BEAR, AND T. PSEUDOSPIRALIS

OOI, Hong Kean;KAMIYA, Masao;OHBAYASHI, Masashi;NAKAZAWA, Masatoshi

Permalink : http://hdl.handle.net/2115/2975
KEYWORDS : Trichinella spiralis;T.pseudospiralis;infectivity;rodent;cold resistance

Abstract

Infectivity in ICR mice and Wistar rats, and resistance to low temperature were compared among T. spiralis isolated from a polar bear in Sapporo, Japan (designated p.bear isolate), T.spiralis isolated from pig in Poland (designated pig isolate) and T.pseudospiralis. The infectivity rate in the ICR mice of the T.spiralis-p. bear isolate was the same as T.pseudospiralis. However, the T.spiralis-pig showed an exceptionally high infective rate not only in mice but also in Wistar rats. T.spiralis-p. bear showed an exceptionally low infectivity rate in rats but was comparatively resistant to low temperature treatment, surviving at -20℃ for a month. Nevertheless, all three Trichinella were not viable after one day at -40℃. Comparison of the length of the muscle larvae recovered 20-24 months after infection in mice showed that it is possible to distinguish the larvae of T.spiralis-pig isolate from T.pseudospiralis but not T.spiralis-p.bear isolate from the other two.

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