Background and Aims: Newcastle disease (ND) is a highly contagious disease in poultry with economic losses in the world. Vaccination is one of the most important ways for prevention and control of NDV, but there are reports of ND outbreaks in vaccinated chickens. Poor quality of the vaccines is one of the reasons of vaccine failure. In this study the quality of two commercial oil-emulsion Newca...

Background & Aims: Various antiviral drugs such as amantadine are used to treat influenza. This drug is categorized in group C and few researches have been conducted about its toxic effects on human fetus. In the current study, the pathologic effects of the drug as well as drug efficacy in reducing influenza virus titer in the developing chicken embryo were assessed. <br ...

  Avian Influenza (AI) is a viral respiratory disease of domestic and wild birds. In the diagnostic laboratory, it is essential to have methods for rapid detection of avian respiratory viruses. Cloacal swabs collected from chickens experimentally infected with H9 subtype AI virus, used in a reverse transcription-polymerase chain reaction (RT-PCR) assay for detection of AI. In infected animals, ...

Endoribonuclease splitting single-stranded poliovirus RNA is associated with virions of the myxoviruses fowl plague virus and Newcastle disease virus. These virions are devoid of deoxyribo­ nuclease hydrolyzing single-stranded M 13 phage DNA and ribonuclease hydrolyzing double­ stranded poliovirus RNA. The latter enzyme, however, is present in allantoic fluids of infected chick embryos from whi...

SARS coronavirus injected intratracheally into chickens, turkeys, geese, ducks, and quail, or into the allantoic sac of their embryonating eggs, failed to cause disease or replicate. This finding suggests that domestic poultry were unlikely to have been the reservoir, or associated with dissemination, of SARS coronavirus in the animal markets of southern China.