Pneumonic Plague Outbreak, Northern Madagascar, 2011

• Main Authors: Vincent Richard, Julia M. Riehm, Perlinot Herindrainy, Rahelinirina Soanandrasana, Maherisoa Ratsitoharina, Fanjasoa Rakotomanana, Samuel Andrianalimanana, Holger C. Scholz, Minoarisoa Rajerison
• Format: Article
• Language: English
• Published: Centers for Disease Control and Prevention 2015-01-01
• Series: Emerging Infectious Diseases
• Subjects: pneumonic plague; outbreak; Yersinia pestis; bacteria; drug resistance; pathogenicity
• Online Access: https://wwwnc.cdc.gov/eid/article/21/1/13-1828_article

Yersinia pestis, the causative agent of plague, is endemic to Madagascar, particularly to the central highlands. Although plague has not been previously reported in northern Madagascar, an outbreak of pneumonic plague occurred in this remote area in 2011. Over a 27-day period, 17 suspected, 2 presumptive, and 3 confirmed human cases were identified, and all 15 untreated 20 patients died. Molecular typing of Y. pestis isolated from 2 survivors and 5 Rattus rattus rat samples identified the Madagascar-specific 1.ORI3-k single-nucleotide polymorphism genotype and 4 clustered regularly interspaced short palindromic repeat patterns. This outbreak had a case-fatality rate of 100% for nontreated patients. The Y. pestis 1.ORI3-k single-nucleotide polymorphism genotype might cause larger epidemics. Multidrug-resistant strains and persistence of the pathogen in natural foci near human settlements pose severe risks to populations in plague-endemic regions and require outbreak response strategies.