ISSN:
1365-2761
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
,
Medicine
Notes:
Abstract. On the basis of previous observations, in vivo experiments were conducted in rainbow trout, Oncorhynchus mykiss (Walbaum), to detect possible competition between strains of Aeromonas salmonicida differing in their pattern of resistance to antimicrobial drugs. Serial infections, or reinfection of naturally-infected trout, were induced by intramuscular injection. Surviving fish were artificially stressed, and all dying fish were examined using selective media to assess the type of latent infection. Secondary infections with virulent strains always resulted in mortality and reisolation of the secondary strain in pure culture. However, when trout having undergone the two successive infections were stressed, the primary strain was always reisolated. Primary strains seem to be able to survive in unknown locations within cells or tissues, regardless of their virulence or growth potency. Although a protective effect conferred by latent infection to secondary challenge could not be clearly proven, such mechanisms resemble what occurs in premunition and could be of epidemiological interest.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1365-2761.1991.tb00612.x
