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Volume 18, Number 11—November 2012


Seroprevalence of Antibodies against Chikungunya, Dengue, and Rift Valley Fever Viruses after Febrile Illness Outbreak, Madagascar

Norbert G. Schwarz1Comments to Author , Mirko Girmann1, Njary Randriamampionona, Alexandra Bialonski, Deborah Maus, Anne Caroline Krefis, Christine Njarasoa, Jeanne Fleury Rajanalison, Herly Daniel Ramandrisoa, Maurice Lucien Randriarison, Jürgen May, Jonas Schmidt-Chanasit, and Raphael Rakotozandrindrainy
Author affiliations: Bernhard Nocht Institute for Tropical Medicine, Hamburg, Germany (N.G. Schwarz, M. Girmann, A.C. Krefis, J. May); World Health Organization Collaborating Centre for Arbovirus and Haemorrhagic Fever Reference and Research, Hamburg (A. Bialonski, D. Maus, J. Schmidt-Chanasit); Université d’Antananarivo, Antananarivo, Madagascar (N. Randriamampionona, R. Rakotozandrindrainy); Hôpital d’Ambositra, Ambositra, Madagascar (C. Jnarasoa); Medecin Inspecteur de Tsiroanomandidy, Tsiroanomandidy, Madagascar (J.F. Rajanalison); Medecin Inspecteur de Moramanga, Moramanga, Madagascar (H.D. Ramandrisoa); and Centre de Santé de Base Urban de Mananjary,Mananjary, Madagascar (M.L. Randriarison)

Main Article

Table 1

Measurement of antibodies against CHIKV, DENV, and RVFV in samples from pregnant women in Madagascar, May–July 2010*

Location Altitude, m Month Total no. women No. (%) women with
IgG against CHIKV IgG against DENV IgG against RVFV IgG against CHIKV/DENV† IgM against CHIKV‡
Mananjary 0 (coastal) May 195 87 (44.6) 34 (17.4) 2 (1) 14 (7.2) 53 (27.5)
Manakara 0 (coastal) Jun 251 57 (22.7) 27(10.8) 1 (0.4) 6 (2.4) 13 (5.2)
Ifanadiana 466 Jun 197 2 (1.0) 4(2.0) 0 0 0
Moramanga 920 Jul 198 6 (3.1) 23(11.7) 0 1 (0.5) 0
Tsiroanomandidy 860 Jul 203 0 8 (3.9) 1 (0.5) 0 0
Ambositra 1,280 May 175‡ 2 (1.1) 1(0.6) 0 1 (0.6) 0

*CHIKV, chikungunya virus; DENV, dengue virus; RVFV, Rift Valley fever virus.
†Samples that were positive for IgG against both CHIKV and DENV.
‡For 25 women from Ambositra, no serologic samples were taken. No samples were positive for IgM against DENV.

Main Article

1These authors contributed equally to this article.