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characterization of a newcastle disease virus isolated from a parrot (psittacus erythracus) in nigeria.the characteristics of a newcastle disease virus isolated from a parrot (psittacus erythracus) in nigeria were examined using standard laboratory tests. minimum lethal dose in embryos was 10(-10), mean death time 44.8 h. the intracerebral and intravenous pathologic indices were 1.65 and 2.42, respectively. the virus was resistant at ph 3 and ph 7.2 and the hemagglutinin was thermostable at 56 c for 120 min. of 10 mammalian species of erythrocytes examined, those of equine and rat were not agglut ...19817310954
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