Studies on Cytopathogenic Avian Enteroviruses II. Influence of Age on Virus Excretion and Incidence of Certain Serotypes in a Colony of Chicks

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Abstract
Fecal samples of a group of 34 chickens were examined monthly from 1 month of age up to 11 months. Of 308 samples examined, 49 contained chloroform-resistant agents. The earliest and the highest number of isolates were made in the 2nd- and 3rd-month materials. The results indicate that excretion of enterovirus is definitely correlated with age. Attempts to isolate these agents from 1 chicken failed during the whole observation period. No chicken was found shedding virus belonging to 1 serotype for more than 2 months. All the isolates could be neutralized by the sera prepared against the 5 prototypes reported earlier. Two of the fecal samples in 1 case from 2 chickens showed a mixed infection with serotypes I and HI. Of the isolates, 17 belonged to serotype I, 10 to serotype II, 9 to serotype III, 4 to serotype IV, and 11 to serotype V. Most of the chickens excreted agents belonging to different sero-types in the subsequent months.

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