Genetic diversity of enteroviruses in patients with respiratory infection

Abstract

Enterovirus genetic variability underlies the variety of clinical forms of diseases they cause. The aim of the presented study was to establish the genetic diversity of enteroviruses (EVs) that caused acute respiratory infection (ARI) in 2016–2019. Biological samples were obtained from 203 patients with various forms of ARI, EV detection was carried out by RT-PCR, followed by sequencing of the main capsid protein gene and phylogenetic reconstruction. EV RNA was detected in 34.4 % of samples, most often in children aged 1–6 years (53.1–54.8 %). Coxsackieviruses B were found in patients with respiratory enterovirus infection (EVI) significantly more often than other EVs, the dominant serotypes were Coxsackievirus B4, B5. Despite the significant genetic diversity of EVs identified in patients with ARI (three genetic lines of Coxsackievirus B5, two genotypes of Coxsackievirus B2, one genotype of Coxsackievirus B3, three genovariant Coxsackievirus B4, one genovariant Coxsackievirus B1), there is no evidence of their connection with the formation of the respiratory form of EVI.The high level of genetic variability of EVs requires regular molecular-epidemiological surveillance for the identification of emerging genetic variants and assessment of their epidemic potential.