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J Gen Virol 89 (2008), 2132-2135; DOI 10.1099/vir.0.2008/002121-0

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Short Communication

Me Tri virus: a Semliki Forest virus strain from Vietnam?

Le Van Tan1, Do Quang Ha1, Vo Minh Hien2, Lia van der Hoek3, Jeremy Farrar1,4 and Menno D. de Jong1,3,4

1 Oxford University Clinical Research Unit, 190 Ben Ham Tu, Ho Chi Minh City, Vietnam
2 Hospital for Tropical Diseases, 190 Ben Ham Tu, Ho Chi Minh City, Vietnam
3 Department of Medical Microbiology, Academic Medical Center, University of Amsterdam, Meibergdreef 15, 1105 AZ, Amsterdam, The Netherlands
4 Centre for Tropical Medicine, Oxford University, UK

Correspondence
Menno D. de Jong
dejongmd{at}gmail.com

Me Tri virus (MTV) is a member of the Semliki Forest virus (SFV) complex in the genus Alphavirus, first isolated from Culex tritaeniorhynchus mosquitoes in Vietnam in 1971 and described as a newly recognized alphavirus, based on antigenic characterization. However, based on a partial nucleotide sequence of the E1 envelope glycoprotein gene, it has recently been argued that MTV may represent a variant of SFV rather than a separate species. To enable definitive classification, we determined the complete genome sequence of MTV from original virus stock. Nucleotide homology, as well as phylogenetic analyses based on whole and partial genome sequences confirmed that MTV is an isolate of SFV. Notable differences to other reported SFV sequences included a 122 nt insertion at the 5' non-translated region (NTR), likely resulting from homologous recombination of part of the nsP2 gene, and differences in the sequence length of the 3' NTR. To our knowledge, this is the first and only documentation of SFV isolation outside Africa. Further research is needed to clarify whether SFV continues to circulate in Vietnam.

The GenBank/EMBL/DDBJ accession number of the sequence reported in this paper is EU350586.

The sequence of the primers used in this study is shown in Supplementary Table S1, available with the online version of this paper.






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