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Journal of Clinical Microbiology, November 2001, p. 4020-4025, Vol. 39, No. 11
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.11.4020-4025.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Emergence of G9 P[6] Human Rotaviruses in Argentina: Phylogenetic Relationships among G9 Strains

Karin Bok,1,* Gustavo Palacios,2 Karina Sijvarger,3 David Matson,4 and Jorge Gomez1

Viral Gastroenteritis Laboratory,1 and Neuroviruses Division2 National Institute of Infectious Diseases, Buenos Aires, and Central Laboratory, Regional Hospital, Ushuaia,3 Argentina, and Center for Pediatric Research, Children's Hospital of The King's Daughters, Eastern Virginia Medical School, Norfolk, Virginia4

Received 17 January 2001/Returned for modification 3 April 2001/Accepted 9 September 2001

Because rotavirus diarrhea can be reduced through vaccination and because current vaccine candidates provide protection against only the most common G antigenic types (G1 to G4), detection of uncommon G types is one of the main goals of rotavirus surveillance. After a 2-year nationwide rotavirus surveillance study in Argentina concluded, surveillance was continued and an increase of G9 prevalence in several Argentine cities was detected. During this period G9 strains predominated in the south, and a gradient of decreasing G9 prevalence was observed from south to north (41 to 0%). Sequence analysis of gene 9, encoding the G antigen, showed that Argentine strains cluster with most G9 isolates from other countries, showing less than 2% nucleotide divergence among them, but are distinctive from them in that they present some unique amino acid changes. Our results agree with reports of increased G9 prevalence in other parts of the world, suggesting the need to incorporate G9 into candidate rotavirus vaccines.

* Corresponding author. Mailing address: Departamento de Virus, Instituto Nacional de Enfermedades Infecciosas, ANLIS, "Dr. Carlos G. Malbran," Av. Velez Sarsfield 563 (1281), Buenos Aires, Argentina. Phone: 54 11 43017428. Fax: 54 11 43025064. E-mail: kbok{at}anlis.gov.ar.

Journal of Clinical Microbiology, November 2001, p. 4020-4025, Vol. 39, No. 11
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.11.4020-4025.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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