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. 1972 Jan;5(1):83–90. doi: 10.1128/iai.5.1.83-90.1972

Degree of Immunity Induced by Killed Vaccines to Experimental Salmonellosis in Mice

Mendel Herzberg 1, Peter Nash 1, Sharon Hino 1
PMCID: PMC422325  PMID: 4570987

Abstract

Killed vaccines, deoxycholate-extracted or heated, were shown to induce an effective degree of immunity which protected against death (100%), prevented extensive multiplication, and left the mice with low residual salmonella populations in spleen and liver after intravenous (iv) or intraperitoneal (ip) challenge with virulent Salmonella typhimurium. Protection was most effective against the ip challenge route and less effective against the iv route. A study of the kinetics of the population of bacteria in the spleens and livers of immunized animals showed that after ip challenge there was an initial reduction of 99% at 6 hr after challenge, maintenance of levels of less than 103 bacteria per organ, and a final population of 102 to 103 per organ at 21 days. With iv challenge, after an initial reduction of 90% at 6 hr, growth ensued to levels above 106 bacteria per organ until 8 days, followed by a steady decline yielding residual populations of 103 to 104 in some cases. Organ hypertrophy correlated with bacterial population. Morbidity was prevented (as measured by gain in body weight) by immunization against ip challenge but not against iv challenge. Killed vaccines protected by their ability to induce an immune state which reduced the initial challenge population, prevented extensive multiplication, yet allowed “cellular immunity” to develop due to response to the living challenge infection itself. The consequence was a low-level carrier state similar to that induced by recovery from sublethal virulent infection.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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