US closely monitoring case of lab worker who possibly died of plague in Siberia

A 28-year-old researcher, Darya Shipilova, fell ill at the Irkutsk Anti-plague Research Institute and died two days later in a regional hospital, prompting local quarantines and widespread concern. Reports suggest a possible laboratory mishap and suspected plague infection, but officials have issued conflicting accounts: a regional governor first declared plague then softened his wording, while the national health watchdog described her death as “pneumonia of unknown aetiology,” saying tests found no lab-related micro-organisms. The institute and several hospitals have imposed lockdowns, staff are reportedly being kept on-site, visits have been restricted, screening and mask requirements introduced, and some public events canceled. Federal sanitary chief Anna Popova traveled to Irkutsk and authorities say identified contacts are under observation with negative test results so far.

U.S. officials, led by Secretary of State Marco Rubio, say they are closely monitoring the situation but not yet alarmed, and some U.S. politicians have cited the case to criticize Russian biosecurity practices. Plague is endemic among wild rodents in parts of Siberia though human cases are rare; a virology professor described the incident as likely a rare lab accident with limited epidemic potential given identified contacts, available antibiotics and current containment measures. Local anxiety persists amid unclear official messaging.