[1] Natl Ctr Infect & Parasit Dis, 44a Gen N Stoletov Blvd, Sofia 1233, Bulgaria
[2] Fundacao Oswaldo Cruz, Lab Flavivirus, Inst Oswaldo Cruz, Rio De Janeiro, Brazil
[3] Univ Campus Biomed Roma, Dept Sci & Technol Humans & Environm, Rome, Italy
[4] Univ Cent Florida, Burnett Sch Biomed Sci, Orlando, FL 32816 USA
[5] Univ Campus Biomed Rome, Unit Med Stat & Mol Epidemiol, Rome, Italy