background: despite the use of prophylactic chemotherapy and vaccination, coccidiosis is still one of the most devastating diseases in poultry industry. understanding the immune mechanism helps researchers to prevent this parasitic infection more effectively. objectives: the purpose of this study was to evaluate the antibody response in chickens, induced by a live attenuated vaccine (livacox q)...

The objective of this study was to compare the effect of two conventional H9N2 avian influenza (AI) vaccines on replication and shedding of the H9N2 AI virus in broiler chickens. These inactivated oil emulsion vaccines contain either a UAE or an Iranian H9N2 AI isolate. One hundred and fifty one-day-old commercial broiler chickens were randomly divided into six groups. The birds, except for the...

The objective of this study was to compare the efficacy of two avian influenza (AI) H5-inactivated vaccines containing either an American (A/turkey/Wisconsin/68 H5N9; H5N9-WI) or a Eurasian isolate (A/chicken/Italy/22A/98 H5N9; H5N9-It). Three-week-old specific pathogen-free chickens were vaccinated once and challenged 3 wk later with a H5N1 highly pathogenic AI (HPAI) virus isolated from a chi...

the objective of this study was to compare the effect of two conventional h9n2 avian influenza (ai) vaccines on replication and shedding of the h9n2 ai virus in broiler chickens. these inactivated oil emulsion vaccines contain either a uae or an iranian h9n2 ai isolate. one hundred and fifty one-day-old commercial broiler chickens were randomly divided into six groups. the birds, except for the...

The virulence of four South African field isolates of NAD-dependent Haemophilus paragallinarum and two field isolates of NAD-independent H. paragallinarum has previously been tested in unvaccinated chickens. In this study, the disease profiles caused by the NAD-dependent isolates of H. paragallinarum in vaccinated chickens were studied. It was shown that the clinical signs induced in the vaccin...

The effectiveness of two commercial infection bronchitis vaccines including H120 and 4/91 was evaluated in broiler chickens challenged with IBV strain IRFIB32 in different vaccination programmes. For this purpose, 180 day-old Cobb 500 chicks were randomly divided in six treatment groups. Four chicks in each group were humanely sacrificed at 2, 4, 6 and 10 days post challenge for evaluating cili...

Because fatal infections with highly pathogenic avian influenza A (HPAI) virus subtype H5N1 have been reported in birds of prey, we sought to determine detailed information about the birds' susceptibility and protection after vaccination. Ten falcons vaccinated with an inactivated influenza virus (H5N2) vaccine seroconverted. We then challenged 5 vaccinated and 5 nonvaccinated falcons with HPAI...

Studies were performed to determine if mucosal vaccination with inactivated avian metapneumovirus (aMPV) subtype C protected turkey poults from clinical disease and virus replication following mucosal challenge. Decreases in clinical disease were not observed in vaccinated groups, and the vaccine failed to inhibit virus replication in the tracheas of 96% of vaccinated birds. Histopathologically...

Vaccines derived from the lentogenic and mesogenic strains are used for the protection of clinical ND in chickens. No information is available on the protection offered by these vaccines against virus replication and shedding in Nigeria. This study compared the abilities of La Sota and Komarov vaccines to protect chickens against replication and shedding in chickens challenged with the velogeni...

Despite the intensive vaccination policy that has been put in place to control Newcastle disease virus (NDV), the recent emergence of NDV genotype VII strains in Korea has led to significant economic losses in the poultry industry. We assessed the ability of inactivated, oil-emulsion vaccines derived from La Sota or Ulster 2C NDV strains to protect chickens from challenge with Kr-005/00, which ...