Synergistic effect in viral bacterial infection: combined infection of the murine respiratory tract with Sendai virus and Pasteurella pneumotropica

G. J. Jakab, E. C. Dick

Research output: Contribution to journalArticlepeer-review

Abstract

Synergism was demonstrated between Sendai virus and Pasteurella pneumotropica in the respiratory tract of mice showing no evidence of previous infection with either agent. Mice aerosol challenged with P. pneumotropica invariably eliminated the viable organism from their lungs within 72 hr. In contrast, intrapulmonary killing was delayed in animals previously infected with Sendai virus. Maximum synergism was observed when virus infection preceded bacterial challenge by 6 days. At this time, a mortality rate of 37% was observed as compared with 0, 10, 20, and 10%, respectively, in those animals in which the virus infection preceded bacterial challenge by 1, 3, 9, and 12 days. Previous immunization with Sendai virus completely prevented virus infection and thus the synergistic effect. Synergism with endogenous flora was also noted. Six days after virus infection an endogenous Pasteurella sp. began to proliferate in the bronchopulmonary tissues. Up to 104 colony forming units per lung were recovered but no animals died of the endogenous Pasteurella infection.

Original languageEnglish (US)
Pages (from-to)762-768
Number of pages7
JournalInfection and immunity
Volume8
Issue number5
DOIs
StatePublished - 1973

ASJC Scopus subject areas

  • Parasitology
  • Microbiology
  • Immunology
  • Infectious Diseases

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