[1] Natl Inst Cholera & Enter Dis, Div Virol, Kolkata 700010, W Bengal, India
[2] Natl Inst Cholera & Enter Dis, Div Clin Med, Kolkata 700010, W Bengal, India
[3] ICMR Virus Unit, Kolkata 700010, W Bengal, India
[4] Reg Med Res Ctr, Div Microbiol, Bhubaneswar 751023, Orissa, India
[5] Postgrad Inst Med Educ & Res, Dept Virol, Chandigarh 160012, India
[6] Reg Med Res Ctr NE, Div Microbiol, Dibrugarh 768001, Assam, India
[7] Sapporo Med Univ, Sch Med, Dept Hyg, Sapporo, Hokkaido 060, Japan