title: Seroprevalence of avian influenza virus and its relationship with increased mortality and decreased egg production.
abstract: To evaluate the occurrence of avian influenza viruses (AIV) infections in southern Pakistan, an enzyme-linked immunosorbent assay was initially used to screen sera from broiler, layer and broiler breeder flocks for the presence of antibodies to type A influenza viruses. Data from this survey showed high levels of AIV antibodies, indicating unrecognized AIV infection occurring in these flocks. Based on this information a second investigation was undertaken in selected broiler-breeder, broiler and layer flocks. In this investigation, nine H9N2 AIV isolates were recovered. Serological data from this investigation indicated that chickens in flocks with a previous history of respiratory tract infection and some without overt clinical respiratory signs had seroconverted to H9N2 AIV.
authors.affiliation: Animal Sciences Institute National Agricultural Research Centre Park Road Islamabad-45500, Pakistsan. naeem22@isb.comsats.net.pk
authors.forename: K
authors.initials: K
authors.lastname: Naeem
authors.forename: M
authors.initials: M
authors.lastname: Naurin
authors.forename: S
authors.initials: S
authors.lastname: Rashid
authors.forename: S
authors.initials: S
authors.lastname: Bano
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis; D000956:Antigens, Viral / Q000032:analysis / Q000276:immunology; D002645:Chickens / Q000276:immunology / Q000502:physiology / Q000821:virology*; D004196:Disease Outbreaks / Q000662:veterinary; D004797:Enzyme-Linked Immunosorbent Assay; D009980:Influenza A virus / Q000276:immunology / Q000302:isolation & purification* / Q000472:pathogenicity*; D005585:Influenza in Birds / Q000453:epidemiology / Q000401:mortality* / Q000503:physiopathology*; D010058:Oviposition / Q000502:physiology*; D010154:Pakistan / Q000453:epidemiology
chemical_list: D000914:Antibodies, Viral; D000956:Antigens, Viral