Isolation of Avian Pneumoencephalitis (Newcastle Disease) Virus From the Yolk Sac of Four-Day-Old Chicks, Embryos, and Infertile Eggs.
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D000818:Animals; D001717:Birds; D002645:Chickens; D004531:Eggs; D009521:Newcastle Disease; D009522:Newcastle disease virus; D015017:Yolk Sac