US monitoring suspected plague case after lab worker dies in Siberia
The United States says it is closely monitoring the death of a Russian laboratory technician at a plague research centre in Siberia. The case has prompted precautionary observation of nearly 200 contacts, while Russian authorities say they have found no emergency situation at the institute. Officials have also said there is no evidence so far that the incident has led to wider spread.
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US Secretary of State Marco Rubio said there was concern the incident could have involved pneumonic plague, but added that there was no cause for alarm. He said the case was being watched closely because of the risk that an infection could spread if it were not contained. Russian officials said the woman's cause of death was listed as pneumonia of undetermined etiology, meaning the origin had not been established.
Irkutsk governor Igor Kobzev said no micro-organisms linked to the woman's work had been found in her biological samples. He also said, citing Russia's consumer and health watchdog Rospotrebnadzor, that no other staff from the plague institute had sought medical attention since her death. Rospotrebnadzor said a biological safety team inspected the Anti-Plague Institute of Siberia and the Far East in Irkutsk and found no emergency situation there.
The incident matters because plague remains a serious public-health concern in regions where the bacterium occurs naturally in wild rodents. The woman had recently visited the Buryatia region on the border with Mongolia, where the plague bacterium is found among animals such as marmots. Russian media reported that the precautionary monitoring covered people who had contact with her, reflecting concern about possible exposure in a laboratory and fieldwork setting.
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The Anti-Plague Institute of Siberia and the Far East was created in response to an outbreak in the 1920s, underlining the long history of plague surveillance in the region. Kremlin spokesman Dmitry Peskov urged people not to listen to rumours and instead rely on official statements from Rospotrebnadzor. The case has also drawn attention because it involves a research institution working on a pathogen with a long record of causing severe outbreaks.
What remains unclear is how the woman became ill and whether her death was connected to laboratory work, field exposure, or another cause. Russian officials have not reported any additional cases among staff, and the US has said it is monitoring the situation rather than treating it as an emergency. The next developments to watch are any further laboratory findings, confirmation of the diagnosis, and whether the observation period for contacts leads to any new cases.
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