characterization of isolated pigeon paramyxovirus-1 (pmv-1) and its pathogenicity in broiler chickens were studied. two hundred and thirty-two samples collected from 50 unvaccinated pigeons lofts suspected to newcastle disease from private houses and bird markets from ahvaz , iran. swab samples from cloaca and oropharynx of live pigeons and from trachea, lung, liver, spleen, kidney, brain, prov...

In this study we compared protection by DNA vaccination with the F (pCMV-F) or N (pCMV-N) gene from avian metapneumovirus (aMPV) in turkeys. One-week-old turkey poults received two intramuscular injections 2 wk apart. Birds were challenged with a turkey-embryo-adapted aMPV at 5 wk of age. Birds vaccinated with pCMV-F had decreased clinical signs of disease as well as significantly reduced virus...

Vaccination against H5N1 highly pathogenic avian influenza in endemically affected areas is a potentially attractive option for local prevention and control. In Indonesia the majority of local outbreaks have occurred in back yard flocks with native chickens, and it is therefore of interest to determine whether these birds can be protected against infection by vaccination. To this end two transm...

Vaxsafe ST (Bioproperties Pty Ltd) is an aroA deletion mutant vaccine for the control of Salmonella Typhimurium in chickens. It is registered for spray and drinking water applications and has been shown to aid in the control of Salmonella in short lived birds (such as broilers). The main objective of this study was to test efficacy of Vaxsafe ST with a new vaccination program aimed at lengtheni...

This study was performed to investigate the effects of dietary threonine (Thr). level on performance, metabolizable energy, intestinal morphology, and immune system in coccidian–infected broiler chickens. The diets contained: 88%, 100% (Non challenged (NC) and challenged control (PC)), 112%, 124%, and 136% of Thr requirement according to Cobb 500 recommendation and fed during grower (pre challe...

A study has been carried out for determining of cross-immunity between Massachusetts (Mass) M41 and Iranian IR/773/2001 (793/B) strains of infectious bronchitis virus. Two groups of 20 three weeks old SPF chickens vaccinated subcutaneously with two oil-emulsions inactivated Infectious Bronchitis Vaccines (Mass M41 and Iranian IR/773/2001 strains) that had been manufactured in Razi institute in ...

Most highly pathogenic avian influenza viruses (AIV) emerge after field passage of non-pathogenic AIVs in birds. The outbreak of low-pathogenic H7N1 avian influenza virus in Italy during 1999-2000 followed by outbreak of highly pathogenic H7N1 avian influenza virus is one example in this regard. This experiment has been designed to investigate the effect of pre-infection of birds with LPAI on s...

a study has been carried out for determining of cross-immunity between massachusetts (mass) m41 and iranian ir/773/2001 (793/b) strains of infectious bronchitis virus. two groups of 20 three weeks old spf chickens vaccinated subcutaneously with two oil-emulsions inactivated infectious bronchitis vaccines (mass m41 and iranian ir/773/2001 strains) that had been manufactured in razi institute in ...

Five commercial LaSota strain Newcastle disease (ND) vaccines namely A, B, C, D and E were evaluated for their potency, efficacy, thermostability and influence on productivity in broilers. A 3-log10 difference of EID50 and two-to-eight fold difference of HA activity was found among the various vaccines tested. One hundred and fifty day-old broiler chicks were divided into six equal groups tagge...