Erysipelothrix rhusiopathiae: Association of Spa-type with Serotype and Role in Protective Immunity

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2010-03-01
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Ingebritson, Alaina
Roth, James
Roth, James
Hauer, Paul
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Roth, James
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Veterinary Microbiology and Preventive Medicine
Abstract

A collection of swine, fish, and cetacean Erysipelothrix rhusiopathiae strains representing 16 serotypes was analyzed for possession of the three currently recognized surface protective antigen (spa)-types: spaA, spaB, and spaC. Polymerase chain reaction (PCR) assays and Western blotting with a SpaA-specific monoclonal antibody demonstrated that spa-type is not confined to specific serotype groups. In particular, the spa-type of strains of aquatic origin was more variable than those of terrestrial origin, and possessed the distinct ability to express more than one spa. In a cross-protection study, mice immunized with an E. rhusiopathiae serotype 2 SpaA-type strain and challenged with various E. rhusiopathiae isolates were completely protected against strains exhibiting a single homologous spa, but variably protected against strains possessing a heterologous spa or those harboring more than one spa-type.

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This article is from Vaccine 28, 2490, doi:10.1016/j.vaccine.2010.01.041.

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