Siberia Plague Scare: Russia's Health Watchdog Says Lab Worker Who Died Had Pneumonia of Unknown Cause

Russia's health watchdog says a laboratory worker who died in Siberia had pneumonia of unknown cause. Rospotrebnadzor issued that finding on Sunday, 4 October. The woman worked at the Irkutsk Anti-Plague Institute, a state centre that studies plague. Two days earlier, Alexei Tsydenov, head of neighbouring Buryatia, said she possibly died of plague.

Pneumonic plague attacks the lungs and spreads between people through coughs, the World Health Organization (WHO) says. Russian outlets report at least 197 contacts under medical watch. Officials have also called off planned public events. Igor Kobzev, governor of the Irkutsk region, said on Friday that 'the contacts show no signs of illness.'

Two Official Accounts of One Death

The laboratory assistant was in her late twenties. On Tuesday 29 September, she went into hospital in Shelekhov with severe pneumonia. Doctors put her on a ventilator. She died on 2 October. She told doctors she had broken a test tube of live bacteria while collecting samples, local media reported. Other reports place her first symptoms after fieldwork near the Mongolian border, so even the site of her exposure is in dispute.

Rospotrebnadzor says no accident with harmful microbes took place at the institute, and calls the local situation stable. Tsydenov had cited the same agency on Friday, saying the woman had never been to his republic and her illness had no link to Buryatia. He later amended that statement to more cautious wording, Euronews reported. Officials in the region first described her illness as a particularly dangerous infection, never naming it.

Contact Tracing, Quarantine, and a Criminal Inquiry

Kobzev called an emergency meeting of the regional epidemic commission, and Anna Popova, who runs the watchdog, flew roughly 4,200km (2610 miles) from Moscow to join it. That meeting approved an operational plan of action, which Kobzev ordered carried out in full. He said the watchdog and regional officials had the situation under strict control. He also asked residents across the region to trust only official sources, as his message below shows.

Shelekhov's district hospital went into quarantine while a commission checked it. More than 100 contacts sit in hospital wards, local outlets say, and nearby clinics have been closed to visitors for three weeks. The Irkutsk Aluminium Smelter in Shelekhov ordered workers to wear masks. Parents say nurseries handed out masks, European and Russian media report, and residents are buying antibiotics. Investigators have reportedly opened a criminal case into possible safety breaches linked to the death.

What Remains Unanswered

Mikhail Favorov, a Russian epidemiologist in the US, called the test tube account implausible in remarks to The Moscow Times. Institute staff handle such samples in protective suits, he argued. Gennady Onishchenko, a former head of the agency, said the infection was 'most likely not the plague,' in comments reported by CNN.

The WHO says untreated pneumonic plague can kill within 24 hours, though antibiotics cure it if doctors act early. No state agency has named a bacterium, and Rospotrebnadzor's own diagnosis calls the cause unknown. Tsydenov said his republic has no plague outbreaks at all, including in the districts along its border with Mongolia.