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1960•The Keio Journal of MedicineOpen access

A PRELIMINARY REPORT OF A COMPARISON OF THE SURVIVAL OF HIGH VIRULENT RH STRAIN AND CYST-PRODUCING BEVERLEY STRAIN OF TOXOPLASMA IN RATS

Ichiro Nakayama, TAKEO HOSHIAI

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Abstract

Adult rats were inoculated with RH and Beverley strains of Toxoplasma. Toxoplasma could not be recovered from rats inoculated with RH strain when they were sacrificed 27, 55, 77 and 90 days after the inoculation. On the other hand, the parasites could be isolated from 2 rats inoculated with Beverley strain and sacrificed 27 and 78 days after inoculation, respectively. Two other rats inoculated with the same strain and sacrificed 56 and 92 days after inoculation, respectively, parasites were not recovered. It was conjec-tured that, whatever the strain may be, Toxoplasma could survive very long in rats when the cyst was produced. The case of cyst-production may depend upon the characteristics of individual strain concerned.

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What this paper is about

Adult rats were inoculated with RH and Beverley strains of Toxoplasma. Toxoplasma could not be recovered from rats inoculated with RH strain when they were sacrificed 27, 55, 77 and 90 days after the inoculation. On the other hand, the parasites could be isolated from 2 rats inoculated with Beverley strain and sacrificed 27 and 78 days after inoculation, respectively. Two other rats inoculated with the same strain and sacrificed 56 and 92 days after inoculation, respectively, parasites were not recovered. It was conjec-tured that, whatever the strain may be, Toxoplasma could survive very long in rats when the cyst was produced. The case of cyst-production may depend upon the characteristics of individual strain concerned.

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Available abstract

Adult rats were inoculated with RH and Beverley strains of Toxoplasma. Toxoplasma could not be recovered from rats inoculated with RH strain when they were sacrificed 27, 55, 77 and 90 days after the inoculation. On the other hand, the parasites could be isolated from 2 rats inoculated with Beverley strain and sacrificed 27 and 78 days after inoculation, respectively. Two other rats inoculated with the same strain and sacrificed 56 and 92 days after inoculation, respectively, parasites were not recovered. It was conjec-tured that, whatever the strain may be, Toxoplasma could survive very long in rats when the cyst was produced. The case of cyst-production may depend upon the characteristics of individual strain concerned.

Key concepts: Inoculation, Strain (injury), Virulence, Cyst, Microbiology, Biology, Virology, Pathology

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A PRELIMINARY REPORT OF A COMPARISON OF THE SURVIVAL OF HIGH VIRULENT RH STRAIN AND CYST-PRODUCING BEVERLEY STRAIN OF TOXOPLASMA IN RATS — Research Paper | ScholarLens