Immunosuppressive effect of Cryptosporidium baileyi infection on vaccination against avian infectious bronchitis in chicks.
Two-day-old commercial chicks were inoculated orally with 2 x 10(6) oocysts of Cryptosporidium baileyi and vaccinated with 10(3.5) EID50/head of a commercially available avian infectious bronchitis (IB) live virus vaccine at 4 and 14 days following inoculation. Chicks infected with C. baileyi were shown to have an immunosuppressive effect on IB virus. It is concluded that infection with the protozoon in early life may increase their susceptibility to IB.
Department of Parasitology, Veterinary School, Chonbuk National University, Chonju, Korea. jkr@moak.chonbuk.ac.kr
J K
JK
Rhee
H J
HJ
Yang
S Y
SY
Yook
H C
HC
Kim
D000818:Animals; D002645:Chickens; D018352:Coronavirus Infections / Q000276:immunology / Q000662:veterinary*; D003457:Cryptosporidiosis / Q000276:immunology / Q000662:veterinary*; D003458:Cryptosporidium / Q000276:immunology*; D004198:Disease Susceptibility; D006385:Hemagglutination Inhibition Tests; D007108:Immune Tolerance; D001351:Infectious bronchitis virus / Q000276:immunology*; D011201:Poultry Diseases / Q000276:immunology*; D014765:Viral Vaccines / Q000276:immunology*
D014765:Viral Vaccines