A week after the death of a plague lab worker in Siberia, officials still have not specified the underlying illness that killed her, saying only it was “pneumonia of unknown origin.”

A week after the death of a plague lab worker in Siberia, officials still have not specified the underlying illness that killed her, saying only it was “pneumonia of unknown origin.” ↧ A lab worker at a Russian anti-plague institute died of a mysteriou... The case has drawn questions and concern from the White House and World Health Organization, largely because of what Russia hasn’t told us.