While Russian health officials maintain that no pathogens related to the facility’s work were detected in the woman’s body, the World Health Organization has stated that current information remains insufficient to conduct a full risk assessment.
The researcher worked at a laboratory located approximately 2,500 miles from Moscow, a facility that conducts research on the plague. NPR reported this week that the woman died last week from an illness of unknown origin. In response to the death, Russia’s consumer health watchdog initiated an investigation, ultimately concluding that the employee had not been infected by any of the pathogens handled during her laboratory duties.
Despite official Russian denials that any cases of the plague have emerged in the region, the situation has drawn international scrutiny. During a press conference on Wednesday, Tedros Adhanom Ghebreyesus, the head of the World Health Organization, addressed the lack of transparency regarding the incident. "We don’t yet have the full picture of this event and we’re not able to conduct a full risk assessment," Ghebreyesus said.
The Risks of Pneumonic Plague
The laboratory in question is known to study the plague. While the bubonic form of the disease is typically transmitted via flea bites and manifests in painful, swollen lymph nodes known as buboes, the pneumonic variant presents differently and carries a higher risk of rapid transmission.
Adelaide Miarinjara, a medical entomologist at Emory University, noted that pneumonic plague is particularly dangerous because it is airborne. "It transmits pretty easily between people because it spreads through droplets, almost like COVID spreads," Miarinjara said. Because the disease progresses quickly, she emphasized that early diagnosis is critical for survival. Treatment typically requires the administration of antibiotics, often through intravenous infusion.
The severity of such outbreaks was highlighted by a 2017 event in Madagascar. A single case brought to the coastal city of Toamasina—which had been plague-free for nearly a century—led to an outbreak that resulted in more than 2,400 suspected cases. Approximately 1,900 of those were identified as pneumonic plague, with an estimated mortality rate of 25% among confirmed cases.
Historical Context of Quarantine
Russian authorities have placed 200 "contacts" of the deceased researcher under quarantine, a measure that reflects a practice dating back at least 3,000 years. The term "quarantine" itself originated during the Black Death in the city-state of Dubrovnik, located in modern-day Croatia.
To protect the merchant city, local leaders mandated that visitors remain on a remote island for 40 days before being permitted to enter the city. This period was known as quarantino, derived from the Italian word for 40. The Lazarettos of Dubrovnik were subsequently constructed as the first specialized facilities for this purpose. According to Ivana Marinavić, the head of educational programs at the Lazarettos of Dubrovnik, the enforcement of these early isolation measures was strict, with severe penalties for those who attempted to breach the quarantine.
As of this week, the WHO continues to await further data from Russian officials to determine the circumstances surrounding the lab worker’s death and the status of those currently in isolation.
