High Quality Content by WIKIPEDIA articles! Avian paramyxoviruses 1 through to 11 are multiple unique serotypes of virus in the genera Avulavirus. Newcastle disease virus is another well characterized species within the same genus and is named APMV-1. Currently, avian paramyxoviruses (APMV) consist of eleven distinct known serotypes and the numbers will increase due to isolation of new unknown serotypes. The APMVs are separated into distinct serotypes using Hemagglutination assay and Neuraminidase assay. All the APMVs hemagglutinate chicken RBCs except for APMV-5 which does not hemagglutinate any species RBC making it unique among the APMVs. APMV-6 is also unique to the presence of SH gene between F and HN genes. APMV-11 has the longest genome length among the APMVs.