Further studies on the inhibition of colonization of the chicken alimentary tract with Salmonella typhimurium by pre-colonization with an avirulent mutant.

Abstract excerpt

Oral administration to newly hatched chickens or to chicks up to 5 days of age with an avirulent, rough, spectinomycin-resistant mutant of Salmonella typhimurium strain F98 inhibited the colonization of a nalidixic acid-resistant mutant of the same strain administered by the same route 1 day later. The second strain passed rapidly through the alimentary tract and persisted in the caeca of only a few chickens....

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