Virulence of pPst and pPst strains of for guinea-pigs Free

Abstract

Guinea-pigs were infected subcutaneously or by respiratory challenge with plasmid-containing (pPstpCadpFra) strain 358 and its pPst-pCadpFra, pPstpCadpFra and pPst pCadpFra derivatives, grown at 28°C or at 37°C. Lack of plasmid pPst did not lead to an increase in LD50 with either route of challenge. When the virulence of the four strains grown at the two temperatures was compared, the LD50 values of those grown at 37°C were lower. Respiratory challenge with cultures grown at 37°C mimics the man-to-man pneumonic plague cycle. The average LD50 values decreased two-fold and 10-fold for pPst and pPst variants, respectively. The data suggest that historical epidemic outbreaks of pneumonic plague in the human population residing in the Caucasus region where there are natural plague foci in common voles may have been caused by pPst strains.

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1996-12-01
2024-03-28
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