Me Tri virus: a Semliki Forest virus strain from Vietnam?
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.
Tan
Le Van
LV
Oxford University Clinical Research Unit, 190 Ben Ham Tu, Ho Chi Minh City, Vietnam.
Ha
Do Quang
DQ
Oxford University Clinical Research Unit, 190 Ben Ham Tu, Ho Chi Minh City, Vietnam.
Hien
Vo Minh
VM
Hospital for Tropical Diseases, 190 Ben Ham Tu, Ho Chi Minh City, Vietnam.
van der Hoek
Lia
L
Department of Medical Microbiology, Academic Medical Center, University of Amsterdam, Meibergdreef 15, 1105 AZ, Amsterdam, The Netherlands.
Farrar
Jeremy
J
Centre for Tropical Medicine, Oxford University, UK.|Oxford University Clinical Research Unit, 190 Ben Ham Tu, Ho Chi Minh City, Vietnam.
de Jong
Menno D
MD
Centre for Tropical Medicine, Oxford University, UK.|Department of Medical Microbiology, Academic Medical Center, University of Amsterdam, Meibergdreef 15, 1105 AZ, Amsterdam, The Netherlands.|Oxford University Clinical Research Unit, 190 Ben Ham Tu, Ho Chi Minh City, Vietnam.