Abstract

The effectiveness of vaccines made of viable spores of two strains of Loma salmonae (Microspora) delivered orally to rainbow trout Oncorhynchus mykiss and brook trout Salvelinus fontinalis was evaluated under experimental conditions of re-challenge. Whereas prior exposure to either of two strains of L. salmonae led to marked resistance of rainbow trout to a second challenge, brook trout failed to mount an effective protective response.

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