Lentogenic Newcastle disease virus (NDV) strains were demonstrated by culture and electron microscopically in the gut contents of very young, non-vaccinated chickens from hatching up to day 25. The same virus was demonstrated even in chicken embryos despite the presence of maternal antibodies both in yolk extracts, and in hatched chicks. NDV disappeared from the organism of infected chickens without inducing antibody formation. Post-vaccination antibody titres were very low and various in chickens previously infected with NDV. Possible transovarian transmission of NDV is discussed.
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Pospı́šil et al. (1991) studied this question.
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