Shedding of Lymphoid Leukosis Virus in Chickens Following Contact Exposure and Vaccination

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Abstract
Chickens contact-exposed to lymphoid leukosis virus at various ages up to 32 wk responded with relatively high rates of infection as determined by the presence of neutralizing antibody. Virus shedding as determined by cloacal swab and albumen testing occurred in 7 of 8 groups of such chickens, but the incidence was 10% or less and sporadic. Vaccination of chickens immediately before exposure with a low pathogenicity virus of subgroup A at 8 wk of age did not eliminate subsequent shedding.

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