How worried should you be about the plague?

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A possible plague-related death in Russia has prompted officials to place hundreds of people under medical observation and multiple health care facilities under quarantine. Local reports suggest a worker at an anti-plague research facility died late last week coming into contact with the pneumonic plague pathogen from a test tube at the lab, but the cause of death has not been confirmed by Russian authorities. The story has sparked international concern about how these deadly diseases are handled at research facilities and whether or not this could be the start of a bigger outbreak.