avian gyrovirus 2 and avirulent newcastle disease virus coinfection in a chicken flock with neurologic symptoms and high mortalities.a disease with severe neurologic symptoms caused 100% mortality in a small broiler operation in the gauteng province, south africa in late march 2013. routine diagnostic pcr testing failed to identify a possible cause of the outbreak; thus, samples were submitted for virus isolation, serology, and bacteriology. an avirulent newcastle disease virus (ndv) strain isolated was identified as a v4-like genotype 1 strain, by dna sequencing, with a cleavage site of 112gkqgr decrease l117. real-time reve ...201424758119
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