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Volume 8, Number 3—March 2002

Dispatch

Epidemiologic Features of Four Successive Annual Outbreaks of Bubonic Plague in Mahajanga, Madagascar

Pascal Boisier*†Comments to Author , Lila Rahalison*, Monique Rasolomaharo‡, Maherisoa Ratsitorahina*, Mahafaly Mahafaly‡, Maminirana Razafimahefa‡, Jean-Marc Duplantier§, Lala Ratsifasoamanana¶, and Suzanne Chanteau*
Author affiliations: *Institut Pasteur, World Health Organization Collaborating Center for Plague, Antananarivo, Madagascar; †Hopital d'Instruction des Armees Robert Picque, Bordeaux, France; ‡Androva Hospital, Mahajanga, Madagascar; §Institut de Recherches pour le Developpement, Antananarivo, Madagascar; ¶Plague National Control Programme, Ministry of Health, Antananarivo, Madagascar;

Main Article

Table

Results of bacteriology testing for Yersinia pestis, Mahajanga, Madagascar, by year

1995 1996 1997 1998 Total
Total suspected cases 558 399 539 206 1,702
Laboratory-confirmeda cases 117 97 214 87 515
Bacteriology
Number tested 342 330 501 195 1,368
Number confirmed 55 41 149 52 297
Number presumptive 21 8 2 7 38
Number positiveb 76 49 151 59 335
Percent positive 22.2 14.8 30.1 30.3 24.5
F1 antigen Elisa
Number tested 433 335 413 189 1,370
Number positive 38 25 131 35 229
Percent positive 8.8 7.5 31.7 18.5 16.7
Anti-F1 antibodies Elisa
Number tested 365 344 396 191 1,296
Number positive 68 59 137 48 312
Percent positive 18.6 17.2 34.6 25.1 24.1

aConfirmed + presumptive and/or enzyme-linked immunosorbent-assay (Elisa) positive.
bConfirmed + presumptive cases.

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