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Molecular epidemiology of classic, MLB and VA astroviruses isolated from <5 year-old children with gastroenteritis in Thailand, 2011–2016

Author:
Kumthip, Kattareeya, Khamrin, Pattara, Ushijima, Hiroshi, Maneekarn, Niwat
Source:
Infection, genetics, and evolution 2018 v.65 pp. 373-379
ISSN:
1567-1348
Subject:
Human astrovirus, Norovirus, Rotavirus, children, feces, gastroenteritis, genetic variation, genotype, genotyping, mixed infection, molecular epidemiology, patients, reverse transcriptase polymerase chain reaction, Thailand
Abstract:
This study aimed to investigate the molecular epidemiology and genetic diversity of astrovirus circulating in pediatric patients with acute gastroenteritis in Thailand. A total of 2034 fecal specimens collected between 2011 and 2016 from children hospitalized with acute gastroenteritis were analyzed for astrovirus infection using RT-PCR and nucleotide sequencing techniques. Overall, 54 samples were positive for astrovirus (2.6%). About half of the virus-positive samples (57.4%) were co-infection cases, mainly with rotavirus or norovirus. Genotyping revealed that three major clades, classic human astrovirus (HAstV) and newly emerging MLB and VA astroviruses co-circulated in the study population. At least seven different genotypes were identified and HAstV1 was the most predominant genotype detected (50%), followed by MLB1 (16.7%), HAstV4 (11.1%), HAstV5 and HAstV8 (7.4% each), MLB2 and VA2 (3.7% each). This study provided a useful information and contributed to molecular epidemiology of astroviruses including the novel MLB and VA astoviruses have been characterized and reported for the first time in Thailand.
Agid:
6197771