ArticleMedicine2020
Divergence of group a rotavirus with genetic variations before and after introduction of rotavirus vaccines in northern Taiwan.
Article in Medicine, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Authors and funding
8 authors at 4 institutions in 2 countries.
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No grant is acknowledged in the PubMed record.
Abstract
Despite the development of vaccines in 2006, rotavirus is still a major cause of acute gastroenteritis worldwide. This study was performed to analyze the presence of circulating rotaviruses before and after the introduction of rotavirus vaccines to allow phylogenetic comparisons of vaccine strains in northern Taiwan.Rotavirus genotyping and sequencing of rotavirus VP7 and VP4 PCR products were performed by Reverse Transcriptase Polymerase Chain Reaction and DNA autosequencing. Phylogenies were constructed by the neighbor-joining and maximum-likelihood methods using CLUSTAL W software included in the MEGA software package (version 6.0).Between April 2004 and December 2012, a total of 101 rotavirus specimens from pediatric patients with acute gastroenteritis hospitalized in Chang Gung Children's Hospital were amplified, and their VP4 and VP7 sequences were determined. These 101 specimens consisted of 55 pre-vaccine strains (G1 [13, 23.6%], G2 [12, 21.8%], G3 [16, 29.1%], and G9 [14, 25.5%]) and 46 post-vaccine strains (G1 [25, 54.3%], G2 [12, 26.1%], G3 [5, 10.9%], and G9 [4, 8.7%]). The most common combination of the G and P types was G2P[4], accounting for 36% cases, followed by G9P[8] (25%), G1P[8] (20%), G3P[4] (15%), G3P[8] (10%), G1P[4] (5%), and G2P[8] (5%). Phylogenetic analysis showed that only the G1 and P[8] genotypes clustered in the same lineages with the rotavirus vaccine strains.Based on our results, the inclusion of G9, modified G2 and G3 with target lineages, and the combination G2P[4] and G9P[8] in the rotavirus vaccines in Taiwan is warranted as a vaccination strategy.
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