The World Health Organization says it still has few clear answers about the recent death of a worker at a Russian institute that researched plague. The death has fueled global concern about a rare form of this infectious disease. It’s a rare, often fatal, disease. Pneumonic plague is caused by a bacteria called Yersinia pestis, usually found in small rodents and their fleas. It can be spread to humans through the bite of an infected flea, through unprotected contact with bodily fluid or contaminant or inhalation of respiratory droplets from a patient with the disease.
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