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Journal Article
Research Support, Non-U.S. Gov't
Phylogenetic analysis reveals extensive evolution of avian paramyxovirus type 1 strains of pigeons (Columba livia) and suggests multiple species transmission.
Virus Research 2003 October
Partial sequence and residue substitution analyses of the fusion protein gene were performed for 68 strains of avian paramyxovirus type 1 of pigeons (PPMV-1), an antigenic variant of Newcastle disease virus (NDV) of chickens, derived from 16 countries between 1978 and 2002. The majority of isolates clustered into a single genetic lineage, termed VIb/1, within genotype VI of NDV strains of chickens, whereas a small number of isolates that originated in Croatia after 1995, grouped in a highly diverged lineage, termed VIb/2, indicating a separate host-switching event from that of VIb/1 strains. Four distinct subgroups of lineage VIb/1, Iraqi (IQ), early European (EU/ea), North American (NA) and recent European (EU/re) have emerged and circulated in the past decades. Subgroup EU/ea and NA strains were responsible for the main streams of infection in the 1980s, while EU/re viruses for infections in the 1990s. The degree of genetic diversity of viruses in the early phase of the epizootic suggested a prolonged infection period of the pigeon-type viruses prior to the emergence of the disease in the early 1980s. Shared derived character analysis showed a close genetic relationship to Sudanese viruses from the mid-1970, suggesting that PPMV-1 viruses could be of African origin.
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