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Journal of Tropical Pediatrics 2002 48(5):300-302; doi:10.1093/tropej/48.5.300
© 2002 by Oxford University Press
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Brief Report

Tetravalent Rhesus-human Rotavirus Vaccine (RRV-TV) in Belém, Brazil: Efficacy against Prevailing P and G Genotypes

J. D. P. Mascarenhas1, J. P. G. Leite2, Y. B. Gabbay1, M. L. Almeida3 and A. C. Linhares1

1 Instituto Evandro Chagas, Fundação Nacional de Saúde, Belém, Pará, Brazil 2 Departmento de Virologia, Instituto Oswaldo Cruz, Rio de Janeiro, Brazil 3 Ex-bolsista do Conselho Nacional de Desenvolvimento Cientifíco e Tecnológico, PIBIC/IEC, Brazil

To determine the efficacy of a reassortant rhesus-human tetravalent rotavirus vaccine (RRV-TV) (4 x 104 pfu/dose) against P and G rotavirus genotypes, 90 positive samples were tested using reverse transcription-polymerase chain reaction. The efficacy of the RRV-TV vaccine against P[8] and G1 individually or in binary combination P[8], G1 was 72 per cent (p < 0.005) 61 per cent (p < 0.013), and 70 per cent (p < 0.009), respectively, only for the first year of follow-up. In the second year, as well as after 2 years of follow-up, no efficacy was observed to these genotypes. These data indicate that further studies with rotavirus vaccines should focus on the molecular characterization of rotaviruses genotypes, in order to see whether or not cross-protection among different G and P genotypes may occur as a result of common bearing of VP4 specificities.


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