By Faith Karimi and Emil Hellerud, CNN
Updated 9:15 AM ET, Sat January 31, 2015

A smear shows the presence of the Yersinia pestis bacteria, which causes the plague.

(CNN)An outbreak of the plague has killed dozens in Madagascar, and experts fear those numbers could go up.

At least 119 cases were confirmed by late last year, including 40 deaths, the World Health Organization said in a statement.

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