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The report notes that pneumonic plague cases are rare but have occurred in the U.S. recently. Last year, the CDC launched a pneumonic plague investigation in Arizona after a young adult male died following exposure to two ill cats. During that investigation, officials identified 46 potentially exposed individuals who were administered antibiotics.

A 2024 State Department assessment concluded that Russia maintains an offensive biowarfare program, having absorbed and evolved the old Soviet program. Furthermore, the CDC stated that during the 1970s and 1980s, the Soviet Union manufactured large quantities of antibiotic-resistant Y. pestis (the bacteria that causes plague) to be dispersed as a bioweapon. While the specific institute involved in the recent incident was part of an anti-plague network for surveillance, it also developed vaccines and diagnostics for pathogens modified by the military.

According to David Mansdoerfer, a former health official from the first Trump administration, the government's "playbook" includes several steps: the State Department would issue a travel advisory, the government would contact U.S. citizens in the affected area with guidance, and the Centers for Disease Control and Prevention (CDC) would issue a travel health notice. Furthermore, Customs and Border Protection would implement "ill traveler rules," which can include stopping high-risk individuals from boarding flights or flagging health officials at ports of entry.

Experts have noted that if the worker died from pneumonic plague, there is a possibility it could be a genetically altered version that behaves differently than treatable strains. This concern is linked to the prevalence of "gain-of-function" research and Russia's known history of developing biological weapons. Additionally, there is a concern that the strain might be resistant to standard antibiotics, despite the fact that the U.S. maintains substantial government stockpiles of such medications.

There are two major unknowns: first, officials do not know exactly which pathogen killed the Russian researcher or how well the infection is being contained; second, it is unclear if the pneumonia linked to the plague has spread into the wider community. Currently, reports suggest the infection is limited to the deceased lab scientist, while others in the community remain under close monitoring.

The situation was prompted by the death of a worker at the Anti-Plague Research Institute of Siberia and the Far East who contracted pneumonia. There are conflicting accounts regarding how she became ill and whether she was infected with pneumonic plague, a condition that is almost always deadly without prompt antibiotic treatment. The U.S. government is currently monitoring the situation to determine if the pathogen is contained or if it poses a risk that requires travel advisories or port of entry restrictions.