Intracerebral pathogenicity of influenza A viruses for chickens.
The virulence of influenza A viruses was determined using the intracerebral pathogenicity index test for chickens. The viruses were divided into high virulent, low virulent and avirulent strains. A low virulent strain was recovered from the jejunum and faeces of infected chickens.
D000818:Animals; D001921:Brain / Q000382:microbiology*; D002645:Chickens / Q000382:microbiology; D005243:Feces / Q000382:microbiology; D009980:Influenza A virus / Q000254:growth & development / Q000472:pathogenicity*; D007583:Jejunum / Q000382:microbiology