President Trump said he does not believe a lab worker's death in Russia was caused by a bioweapon, adding Moscow says the situation is 'very much under control' ▻ ↧ CDC sees low plague risk, monitors Siberia arrivals after worker de... Centers for Disease Control and Prevention Director ​Erica Schwartz said on Wednesday the risk to the US ‌from an unconfirmed pneumonic plague case in Siberia was extremely low, but the agency was prepared to monitor and screen travelers.