Persistence, attenuation and protective capacity of the SPI1 and lon mutants for chickens.
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&data for days 21 and 42 of life indicate persistence of the vaccine strains, data for days 46 and 56 of life indicate colonization by the challenge wild-type S. Enteritidis.#number of positive chickens/number of tested.∧n.d., not determined due to the small size of some of the spleens of 21-day-old chickens.*significantly different from non-vaccinated controls by χ2 test at P
创建时间：
2015-12-02
