Aflatoxicosis, infectious bursal disease and immune response to Newcastle disease vaccination in rural chickens

Autor:	G. Mukiibi-Muka, Maxwell O. Otim, Magne Bisgaard, Henrik Christensen
Rok vydání:	2005
Předmět:	Aflatoxin B1 Time Factors animal structures Newcastle Disease Antibodies Viral Infectious bursal disease virus Newcastle disease Group A Virus Group B Infectious bursal disease Feces Immune system Food Animals medicine Animals Uganda Poultry Diseases General Immunology and Microbiology biology Mycotoxicosis Viral Vaccines Birnaviridae Infections biology.organism_classification medicine.disease Virology Vaccination Delayed hypersensitivity Animal Science and Zoology Chickens
Zdroj:	Avian Pathology. 34:319-323
ISSN:	1465-3338 0307-9457
DOI:	10.1080/03079450500179327
Popis:	To investigate the immunosuppressive effects of infectious bursal disease virus (IBDV) and aflatoxin in indigenous chickens of Uganda, Newcastle disease (ND) seronegative chicks were randomly allocated to two treatment groups. Group A chicks were injected intramuscularly at the age of 3 weeks every 2 days up to four times with 0.250 mg aflatoxin B1 per bird, group B was infected occulo-nasally with IBDV 3 days prior to vaccination, while group C was left as a control group. All the chicks from the three groups were then vaccinated with Hitchner B1 vaccine at 21 days of age followed by a secondary vaccination with La Sota vaccine 3 weeks later. Humoral and cell-mediated immune responses were assessed by measuring antibody levels and delayed hypersensitivity reaction post vaccination. Growth performance in the three groups was assessed by weekly body weights while evidence of excretion of vaccinal ND virus was detected by reverse transcription-polymerase chain reaction.A significant (P0.05) reduction in the haemagglutination inhibition of ND antibody titre following initial priming with Hitchner B1 and subsequent booster with La Sota vaccines and a delayed hypersensitivity test following sensitization with dinitrochlorobenzene showed aflatoxin to be a more potent immunosuppressant than IBDV. Aflatoxin exerted its maximum effects during primary antibody response in the second and third weeks post vaccination. Aflatoxin and IBDV did not affect growth rates (P0.05) but prolonged La Sota vaccine virus excretion in faeces. Under our experimental conditions, aflatoxin and IBDV do not significantly affect the immune response of rural chickens to ND vaccination.
Databáze:	OpenAIRE
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