Analysis of 27 rotavirus strains from vaccinated and unvaccinated children revealed reassortment events in 3 strains: a gene derived from a vaccine; a gene acquired from a circulating strain; and reassortment between circulating strains. Data suggest that the widespread use of this monovalent rotavirus vaccine may introduce vaccine genes into circulating human rotaviruses or vice versa.
Keywords: Brazil; G1P[8] strains; RVA; Rotarix; phylogenetic analysis; reassortment; rotavirus; vaccine; viruses.