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Infect Immun. 1993 July; 61(7): 2886-2890

Pneumocystis carinii is not universally transmissible between mammalian species.

Department of Pediatrics, University of Rochester School of Medicine and Dentistry, New York 14642.

ABSTRACT

In a series of five experiments, we attempted to transmit Pneumocystis carinii from ferrets to SCID mice by intratracheal inoculation. Using highly specific and sensitive assay techniques, we could not document infection of SCID mice by P. carinii isolated from ferrets. In contrast, under identical inoculation conditions, P. carinii was easily transmissible from one SCID mouse to another. These results indicate that P. carinii organisms, at least those isolated from ferrets, have a restricted host range. The finding of restricted transmission of P. carinii is consistent with the increasing evidence for host species-specific antigenic variation among isolates of P. carinii. If restricted host range is a consistent biological feature of animal-derived P. carinii, it would suggest that P. carinii pneumonitis in humans may not be a zoonosis as previously speculated.

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