OBJECTIVE: To identify the serotype of 73 non-polio enterovirus (NPEV) strains from acute flaccid paralysis (AFP) cases in Ningxia province, during 1997 - 2011. METHODS: Partial sequencing of the VP1 region was amplified by RT-PCR with degenerate primers and sequenced while sequences were compared with the database of GenBank by the BLAST algorithm. Evolution was analyzed by constructing phylogenetic tree using Mega 5.1. RESULTS: In this study, a total of 73 NPEVs were analyzed, including 4 strains un-typed, 69 strains typed by RT-PCR. A total of 27 serotypes were identified, including 8 serotypes of human enterovirus (HEV)-A, 19 serotypes of HEV-B. The HEV-B group (46/69, 66.7%) constituted the largest proportion of isolates, followed by HEV-A (23/69, 33.3%), but no strains were found that belonged to HEV-C or HEV-D group. In the 69 strains, enterovirus 71 was the most frequently seen isolates, followed by coxsackie-virus A4, 16, 9 and echovirus 24, 6. CONCLUSION: HEV-B was the most predominant (46/69, 66.7%) serotype of NPEV in Ningxia during the AFP surveillance, in 1997 - 2011.
OBJECTIVE: To identify the serotype of 73 non-polio enterovirus (NPEV) strains from acute flaccid paralysis (AFP) cases in Ningxia province, during 1997 - 2011. METHODS: Partial sequencing of the VP1 region was amplified by RT-PCR with degenerate primers and sequenced while sequences were compared with the database of GenBank by the BLAST algorithm. Evolution was analyzed by constructing phylogenetic tree using Mega 5.1. RESULTS: In this study, a total of 73 NPEVs were analyzed, including 4 strains un-typed, 69 strains typed by RT-PCR. A total of 27 serotypes were identified, including 8 serotypes of human enterovirus (HEV)-A, 19 serotypes of HEV-B. The HEV-B group (46/69, 66.7%) constituted the largest proportion of isolates, followed by HEV-A (23/69, 33.3%), but no strains were found that belonged to HEV-C or HEV-D group. In the 69 strains, enterovirus 71 was the most frequently seen isolates, followed by coxsackie-virus A4, 16, 9 and echovirus 24, 6. CONCLUSION:HEV-B was the most predominant (46/69, 66.7%) serotype of NPEV in Ningxia during the AFP surveillance, in 1997 - 2011.