Egbal Sidahmed Abdelrahim Bilal, Iman Mohammed Elnasri, Aymen Mohamed Alhassan, Khalda Abdelaziz Khalifa, Jedddha Ibrahim Elhag, Selma Osman Ahmed
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Biological Pathotyping of Newcastle Disease Viruses in Sudan 2008-2013.
The biological properties and pathogenicity of seven Newcastle disease virus field isolates were studied. These isolates were recovered from different outbreaks in Sudan (5 from chickens and 2 from pigeons) during 2008-2013. Based on intracerebral pathogenicity index, four NDV isolates were characterized as velogenic (their ICPI ranged 2.0-1.6) and three isolates were characterized as mesogenic (ICPI ranged 1.2-1.3). The mean death time for all isolates ranged from 54 to 76.8 hours. The elution time of the viruses from chicken erythrocytes and the ability to haemagglutinate mammalian red blood cells differed considerably in their reactions.
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