Key Facts

• A woman died while working at a Russian lab that handles plague bacteria.
• The illness involved is suspected to be pneumonic plague, a serious lung infection.
• Senator Marco Rubio wants Russia to provide more information about this death.
• The World Health Organization said the risk of the plague spreading in Russia or Europe is low.
• The lab where the woman worked is known to handle deadly pathogens.
• The cause and circumstances of the woman's death have not been fully explained yet.
• Pneumonic plague is a type of plague that affects the lungs and can spread between people.