IRKUTSK — Darya Shipilova, a 28-year-old laboratory technician at the Irkutsk Anti-Plague Research Institute of Siberia and the Far East, died on October 2, 2026. Rospotrebnadzor diagnosed Darya Shipilova with pneumonia of unknown etiology.

The incident occurred at the Anti-Plague Research Institute in Shelekhov, near Irkutsk. Anna Popova, head of Rospotrebnadzor, traveled to the Irkutsk region to coordinate emergency containment measures.

Rospotrebnadzor stated that expanded testing of samples from the patient found no microorganisms associated with her professional activities. The agency reported no accidents involving pathogenic microorganisms at the institute over the past 10 days, according to official statements released on October 2.

Nearly 200 people have been placed under medical observation in the Irkutsk region. Igor Kobzev, governor of the Irkutsk region, stated that all identified contact persons have been placed under medical observation and show no signs of illness, with negative laboratory test results.

Two individuals under medical observation due to contact with Shipilova tested positive for COVID-19, and two others tested positive for rhinovirus, according to reports from the Indian Express. Quarantine has been imposed in at least one of the city’s maternity hospitals.

Maksim Modin, mayor of the Shelekhovsky district, stated that the inpatient facility where the worker was treated has been placed under quarantine. Artem Fominikh, director of the Irkutsk Aluminum Plant, instructed staff to wear masks as a precautionary measure.

The Irkutsk Aluminum Plant's mask mandate, initially justified as a response to the suspected plague, was later described by its director as a routine measure for seasonal respiratory illness. Former colleagues of Darya Shipilova confirmed the institute maintains strict biological-safety protocols, including mandatory plague vaccinations for interns and laboratory staff.

The Irkutsk Anti-Plague Research Institute's website states it specializes in the surveillance, treatment, and biological safety of 'especially dangerous infectious diseases,' including plague. Mikhal Favorov, a senior Russian epidemiologist, disputed the account that a broken test tube caused the infection.

Gennady Onishchenko, a previous head of Rospotrebnadzor, stated that the infection is most likely not the plague and that cold weather would likely prevent transmission. A US State Department official stated: "We are monitoring the situation closely with the CDC [Centers for Disease Control and Prevention] and our other interagency partners."

A US State Department official stated: "We encourage Russian authorities to share accurate information quickly and openly." The US State Department has a history of monitoring public health threats in Russia, including a 2021 initiative to strengthen biosafety protocols at high-risk facilities, according to a 2022 report by the U.S. Government Accountability Office.

Timeline

The last recorded human plague infection in Russia before this case was in 2016, when a 10-year-old boy in Siberia’s Altai Republic contracted plague after helping butcher a marmot. Alexei Tsydenov, governor of the Buryatia region, stated on his Telegram channel that a woman in the neighboring Irkutsk region had died, possibly of the plague.

What's New

Darya Shipilova joined the Irkutsk Anti-Plague Research Institute as a junior staff member in September 2022 at age 24, earning approximately $850 a month, and was still formally listed as a student as recently as 2024, according to unverified claims from the X account International Cyber Digest. Rospotrebnadzor reported no accidents involving pathogenic microorganisms at the Irkutsk Anti-Plague Research Institute over the past 10 days, according to official statements released on October 2.

Alexei Tsydenov stated that there are no plague outbreaks in Buryatia. Mikhal Favorov stated: "It’s laughable. Someone working at the anti-plague Institute in Irkutsk wears a protective anti-plague suit. If you break a test tub, the likelihood of infection is actually very low." Research titled "Epizootic Activity of Natural Plague Foci of the Russian Federation in 2015, and Prognosis for 2016" was published in 2016 in Problems of Particularly Dangerous Infections.

Why It Matters

The World Health Organization states that plague is highly infectious and can be fatal if not treated early. The death of a laboratory technician at a facility specializing in dangerous pathogens has prompted international monitoring and local quarantine measures.