Human astroviruses (HAstVs) have frequently been detected in individuals with acute gastroenteritis (AGE). However, a precise estimate of the overall prevalence of the virus in children with AGE as well as the possible association of the virus with gastrointestinal complications is not available up to now. The present study estimated the overall prevalence of HAstVs in children with gastrointestinal complications as well as the association between the virus and symptoms. We systematically searched four international databases (PubMed, Scopus, Web of Science, and Google scholar) to find studies on the prevalence of HAstVs in people with AGE published between Jan 2000 and Sep 2021. Analysis of the 223 included studies presented a 4.2% (95% CI 3.8%–4.8%) prevalence of the virus in AGE individuals. Based on case‐control studies, a significant association between these viruses and AGE was detected (OR: 2.059, 95% CI; 1.438–2.949). HAstV‐1 and HAstV‐VA‐2 is the most and least common genotypes in the AGE patients, respectively (59.0%, 95% CI: 52.1%–65.6% vs. 4.9%, 95% CI: 2.6%–9.1%). Due to the statistically significant association between HAstV and gastrointestinal complications, more attention should be paid to these viruses in people with AGE and more studies should employ case‐control design.

The present study was conducted to monitor the genotypes of circulating species A rotavirus (RVA) in Iran and investigate genetic linkages between specific RVA VP7, VP4, VP6, and NSP4 segments. For this purpose, 48 RVA strains were detected during the 2021–2022 seasons. The two combinations of G9P[4] and G9P[8] RVA strains were predominant. However, several other combinations of RVA also were detected. Based on the distribution of I and E genotypes (46 strains) with respect to G and P, the most common strains were G9P[4]‐I2‐E2 (19.5%), G9P[4]‐I2‐E1 (6.5%), G9P[4]‐I1‐E1 (4.3%), G9P[8]‐I1‐E1 (19.5%), and G9P[8]‐I2‐E2 (10.9%), which were followed by several other combinations of G and P RVA strains with different pattern of I‐E genotypes and also emerging, rare and uncommon strains. The present study described the continued circulation of G9 strains with the emergence of uncommon G9P[4] and G9P[8] reassortants with three and two different I‐E genotypes, respectively, which have not been reported previously in Iran. Our findings indicated that these uncommon strains exhibited a unique genotype pattern comprising a mixture of genogroup 1 and 2 genes and suggest the need for further analysis of rare, uncommon, and emerging strains of RVA at all 11 gene segments to determine intergenogroup and intragenotype reassortments.

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