Studies on Hantavirus Infection in Small Mammals Captured in Southern and Central Highland Area of Vietnam

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  • LUAN Vu Dinh
    Pasteur Institute, 167 Pasteur Street, 8 Ward, 3 District, Ho Chi Minh City, Vietnam
  • YOSHIMATSU Kumiko
    Department of Microbiology, Hokkaido University Graduate School of Medicine, Kita-15, Nishi-7, Kita-ku, Sapporo 060–8638, Japan
  • ENDO Rika
    Department of Microbiology, Hokkaido University Graduate School of Medicine, Kita-15, Nishi-7, Kita-ku, Sapporo 060–8638, Japan
  • TARUISHI Midori
    Department of Microbiology, Hokkaido University Graduate School of Medicine, Kita-15, Nishi-7, Kita-ku, Sapporo 060–8638, Japan
  • HUONG Vo Thi
    Tay Nguyen Institute of Hygiene and Epidemiology, 59 Hai Ba Trung, Buon Ma Thuot, Dak Lak Province, Vietnam
  • DAT Dang Tuan
    Tay Nguyen Institute of Hygiene and Epidemiology, 59 Hai Ba Trung, Buon Ma Thuot, Dak Lak Province, Vietnam
  • TIEN Pham Cong
    Tay Nguyen Institute of Hygiene and Epidemiology, 59 Hai Ba Trung, Buon Ma Thuot, Dak Lak Province, Vietnam
  • SHIMIZU Kenta
    Department of Microbiology, Hokkaido University Graduate School of Medicine, Kita-15, Nishi-7, Kita-ku, Sapporo 060–8638, Japan
  • KOMA Takaaki
    Department of Microbiology, Hokkaido University Graduate School of Medicine, Kita-15, Nishi-7, Kita-ku, Sapporo 060–8638, Japan
  • YASUDA Shumpei P.
    Department of Microbiology, Hokkaido University Graduate School of Medicine, Kita-15, Nishi-7, Kita-ku, Sapporo 060–8638, Japan
  • NHI Le
    Pasteur Institute, 167 Pasteur Street, 8 Ward, 3 District, Ho Chi Minh City, Vietnam
  • HUONG Vu Thi Que
    Pasteur Institute, 167 Pasteur Street, 8 Ward, 3 District, Ho Chi Minh City, Vietnam
  • ARIKAWA Jiro
    Department of Microbiology, Hokkaido University Graduate School of Medicine, Kita-15, Nishi-7, Kita-ku, Sapporo 060–8638, Japan

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To investigate the distribution of hantaviruses among animals in Southern and Central Highland area of Vietnam, a total of 1311 serum samples were obtained from rats and Asian house shrews (Suncus murinus) captured at 11 locations between 2006 and 2009. A total of 1066 serum samples from rats were examined for IgG antibodies against Hantaan virus, and there were 30 antibody-positive serum samples from rats that had been captured mainly in a port area and urban area in Ho Chi Minh City (HCMC) (2.8%). All of the antibody-positive rats were Rattus norvegicus, and they had Seoul virus (SEOV) genome in their lungs. SEOV sequences detected from rats captured in Southern Vietnam belonged to the same lineage as those from rats captured at Haiphong Port and a market area in Hanoi City. SEOV strain CSG5 was isolated from a rat captured at Saigon Harbor. Strain CSG5 showed a cross-neutralization pattern almost the same as that of a representative strain of SEOV. A total of 245 Asian house shrews were captured in the Central Highland area and near HCMC. Sera were examined for IgG antibodies against Thottapalayam virus (TPMV), and 32 (13.1%) of the antibody-positive shrews were mainly from the Central Highland area and showed a neutralizing antibody against TPMV. These results indicated that SEOV is distributed among R. norvegicus inhabiting harbor and urban areas of Southern Vietnam and that TPMV or an antigenically related virus is distributed among Asian house shrews in Central Highland area.

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