[1] US Ctr Dis Control & Prevent, Natl Ctr Immunizat & Resp Dis, Atlanta, GA USA
[2] Task Force Global Hlth, Decatur, GA USA
[3] Inst Publ Hlth, Control Infect Dis Dept, Tirana, Albania
[4] Inst Pasteur Tunis, Lab Transmiss Control & Immunobiol Infect, Tunis, Tunisia
[5] Minist Publ Hlth, Natl Observ New & Emerging Dis, Tunis, Tunisia
[6] Minist Hlth, Natl Immunizat Program, Yerevan, Armenia
[7] Minist Hlth, Dept Epidemiol & Dis Control, Rabat, Morocco
[8] Natl Inst Publ Hyg, Minist Hlth & Publ Hyg, Abidjan, Cote Ivoire
[9] Uganda Virus Res Inst, Natl Influenza Ctr, Entebbe, Uganda
[10] Minist Hlth, Maternal & Child Hlth Ctr, Viangchan, Laos
[11] WHO, Immunizat Vaccines & Biol, Geneva, Switzerland
[12] Minist Hlth, Dept Dis Prevent & State Sanit & Epidemiol Surveil, Bishkek, Kyrgyzstan