Seroincidence of Influenza Among HIV-infected and HIV-uninfected Men During the 2009 H1N1 Influenza Pandemic, Bangkok, Thailand.
Among 368 Thai men who have sex with men with paired serum samples collected before and during the 2009 H1N1 influenza pandemic, we determined influenza A (H1N1)pdm09 seroconversion rates (≥4-fold rise in antibody titers by hemagglutination inhibition or microneutralization assays). Overall, 66 of 232 (28%) participants seroconverted after the first year of A(H1N1)pdm09 activity, and 83 of 234 (35%) participants seroconverted after the second year. Influenza A(H1N1)pdm09 seroconversion did not differ between human immunodeficiency virus (HIV)-infected (55 of 2157 [35%]) and HIV-uninfected (71 of 2211 [34%]) participants (P = .78). Influenza A(H1N1)pdm09 seroconversion occurred in approximately one third of our Thai study population and was similar among HIV-infected and HIV-uninfected participants.
Division of HIV/AIDS Prevention.
Shikha
S
Garg
Influenza Division , Centers for Disease Control and Prevention , Atlanta, Georgia ; Thailand MoPH-U.S. CDC Collaboration , Nonthaburi.
Sonja J
SJ
Olsen
Armed Forces Research Institute of Medical Sciences , Bangkok.
Stefan
S
Fernandez
National Vaccine Institute , Nonthaburi.
Charung
C
Muangchana
Armed Forces Research Institute of Medical Sciences , Bangkok.
Kamonthip
K
Rungrojcharoenkit
Thailand MoPH-U.S. CDC Collaboration , Nonthaburi.
Prabda
P
Prapasiri
Influenza Division , Centers for Disease Control and Prevention , Atlanta, Georgia.
Jacqueline M
JM
Katz
Division of HIV/AIDS Prevention ; Thailand MoPH-U.S. CDC Collaboration , Nonthaburi.
Marcel E
ME
Curlin
Armed Forces Research Institute of Medical Sciences , Bangkok.
Robert V
RV
Gibbons
Division of HIV/AIDS Prevention ; Thailand MoPH-U.S. CDC Collaboration , Nonthaburi.
Timothy H
TH
Holtz
Department of Disease Control , Ministry of Public Health , Thailand.
Anupong
A
Chitwarakorn
Influenza Division , Centers for Disease Control and Prevention , Atlanta, Georgia.
Fatimah S
FS
Dawood
A(H1N1)pdm09; HIV; Thailand; influenza; pandemic; serology