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The death of a 28-year-old Russian woman who worked at an anti-plague research laboratory has prompted concern from American health authorities and infectious disease experts. The woman died on Friday, according to the World Health Organization. Russian officials attributed her death to pneumonia of “undetermined” origin and stopped short of linking it to her work at the Irkutsk Anti-Plague Institute of Siberia and the Far East. However, the U.S. State Department confirmed it is monitoring reports of a suspected fatal pneumonic plague case in the Irkutsk region of southeastern Siberia, working in coordination with the Centers for Disease Control and Prevention.
Key facts remain unclear. Authorities have not confirmed whether the woman contracted plague at all. If she did, it is also unknown whether the infection came from a natural source or from bacteria studied inside the laboratory. Scientists also do not yet know how quickly her illness progressed or what treatment she received before her death.
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Meanwhile, Russian media reported that nearly 200 people who had contact with the woman are now under precautionary medical observation.
Experts Urge Caution as Investigation Continues
Lisa Morici, a microbiologist and immunologist at the Tulane University School of Medicine, said the connection to the lab may turn out to be coincidental. “Maybe it’s going to come out that she died from something unrelated and it was just a coincidence” that she worked in an anti-plague lab, she said.
Dr. Ashish Jha, the former White House Covid response coordinator, raised broader concerns in an interview with NBC News. “If there were weapons programs, biological weapons programs in these labs, that would be much more concerning to me,” he said. “We need to understand that now,” he added. The situation continues to develop rapidly.
What Is Pneumonic Plague and How Does It Spread?
Plague is an infection caused by the bacterium Yersinia pestis. Historically known as the “Black Death,” it triggered several global pandemics over centuries before the discovery of antibiotics. The World Health Organization identifies three main forms of the disease: bubonic, pneumonic and septicemic. All three result from the same bacterium but affect different parts of the body.
Bubonic plague is the most common form. It spreads primarily through bites from infected fleas or direct contact with infected rodents. It causes painful, swollen lumps in the lymph nodes and is generally not contagious between people. However, if left untreated, it can spread to the lungs and become pneumonic plague.
Pneumonic plague transmits through respiratory droplets when an infected person or animal coughs or sneezes. Dr. Dave Wagner, director of the Pathogen and Microbiome Institute at Northern Arizona University, noted that these droplets travel only about three to six feet before falling to the ground. “They drop to the ground pretty quickly,” he said. Dr. William Schaffner, an infectious disease expert at Vanderbilt University Medical Center, added that close, face-to-face contact poses the greatest risk. “It’s highly unlikely for most people to get the pneumonic form of the disease,” Morici said. In contrast, Covid-19 spreads far more easily through the air, traveling beyond six feet. “It’s nothing like the Covid-19 pandemic,” she said.
Septicemic plague occurs when the bacteria multiply and spread through the bloodstream. It is the least discussed but also highly dangerous form of the disease.
How Deadly Is Pneumonic Plague and How Is It Treated?
Although pneumonic plague is the rarest form of the disease, it is also the deadliest. “It’s the one that’s so frightening because it can kill so quickly,” Morici said. Symptoms typically appear within one to two days of exposure. Patients must receive treatment within 48 hours of showing symptoms to avoid fatal complications. Symptoms include shortness of breath, coughing and blood in the phlegm.
Because of how rapidly it attacks the respiratory system, public health experts consider pneumonic plague the most likely candidate for use in a biological attack. People diagnosed with the disease are often quarantined. Healthcare workers treating patients typically wear N95 masks or full protective suits. “We’re using the strictest levels of biocontainment,” Morici said.
Fortunately, antibiotics remain highly effective against all forms of plague, including the pneumonic strain. “This is why we don’t have big plague outbreaks anymore,” Wagner said. Schaffner also noted there is no evidence that plague bacteria are developing antibiotic resistance. “We will not turn 2026 into the Middle Ages, where the Black Death caused vast amounts of death throughout Europe. That will not happen,” he said. Wagner added that he has no reason to believe this suspected case will spread widely. “The plague that we have today is the same plague that was the scourge of humanity for so long during great pandemics,” he said.
Plague Cases Still Occur in the United States
Plague is not limited to remote regions of Russia. The CDC reports approximately seven plague cases in the United States each year. Most occur in rural areas of the Southwest, including Arizona, California, Colorado and New Mexico. These regions have wild rodent populations, such as prairie dogs, that naturally carry Yersinia pestis bacteria along with their fleas.
Most American patients receive prompt antibiotic treatment and recover fully. Deaths are rare but do occur. Last July, a man in Arizona died of pneumonic plague after exposure to sick cats. Within a week of exposure, he arrived at an emergency department with shallow breathing, a rapid heart rate, chest pain and a dry cough. Despite receiving antibiotics and oxygen, he died within eight hours of hospital admission. Testing later confirmed he had pneumonic plague.
As the investigation into the Russian laboratory death continues, health officials in both countries face pressure to provide clearer answers about what caused the young woman’s illness and whether any broader public health risk exists.
