Suspected Plague Case in Russia: What Infection Preventionists Should Know

The Black Death of the Middle Ages may be returning in Russia with a vengeance…or maybe not. However, whatever the pathogen is, it appears to be spreading and has the Russians on high alert. Here is what has been reported:
 
Axios reported that on September 25, 2026, a 28-year-old worker at the Irkutsk Research Anti-Plague Institute of Siberia broke a test tube containing the plague bacteria. She was admitted to a hospital on September 29 and died of a severe pneumonia-like illness between October 1and 2.

On October 3, The Daily Mail also reported the infection occurred after the laboratory worker “broke a test tube.” Almost 200 contacts were quarantined, and multiple hospitals were placed in lockdown.
 
On October 4, Axios reported that White House monitors suspect the outbreak is caused by plague.
 
On October 5, The Insider reported the disappearance of multiple Russian news articles regarding the outbreak. Russian authorities told the World Health Organization that the worker did not die from plague, and there have been no cases developing in individuals with whom she had contact. The patient died from a “pneumonia of unknown etiology.”

On October 6, Russian media reported a second death in the Irkutsk region. The disease has, thus, spread, and one must assume the outbreak is growing.
 
CNN reported, in an article updated on October 6, that regional authorities have initiated a “comprehensive set of anti-epidemic measures,” and several hospitals in the region have been closed. The country of Kyrgyzstan has introduced quarantine controls at border crossings.

Kevin Esvelt, a biosecurity researcher at MIT, has reported quarantines at 5 Russian hospitals, FSB involvement, hazmat use, and a “weapons-lineage” lab (Figure 1).

The Black Death, or plague, is caused by the bacterium Yersinia pestis. This bacteria decimated Europe in the mid 1300s. It is estimated to have killed 25 million people. If left untreated, infections have a case fatality rate between 30% to 60% for the bubonic type and almost 100% for the pneumonic and septicemic types. Plague is a zoonotic disease that spreads between small rodents and humans via fleas or by handling infected animals.
 
It is suspected from the clinical presentations that the infections are from pneumonic plague. This type of infection has symptoms of “shortness of breath, chest pain, and coughing up blood.”
 
The level of concern displayed by the Russian Government is alarming since there are between 1,000 and 3,000 cases of plague each year, which do not cause such a level of concern. The disease can be cured if caught early and can be prophylaxed using common antibiotics.
 
If the lab technician broke a test tube and was exposed to the bacteria, she should have been immediately prophylaxed; if she wasn’t, she should have been treated promptly. The first-line treatment consists of either fluoroquinolones (ciprofloxacin) or aminoglycosides (gentamicin). Fluoroquinolones and tetracyclines can also be used for postexposure prophylaxis.

However, the development of a fatal infection, especially in a young healthy woman in her 20s, would be highly unexpected. So, there are 2 top possibilities: Maybe it is not Yersinia pestis at all, but a more lethal pathogen, such as a virus, or maybe it is an enhanced antibiotic-resistant form of bacteria that was developed as a bioweapon.
 
Yersinia pestis can develop resistance to multiple antibiotics through plasmids and gene mutations. The bacterium can develop resistance to Β-lactams, tetracyclines, chloramphenicol, sulfonamides, and aminoglycosides. This represents all the treatment recommendations. If all the resistance genes were contained in a single organism, it would be far more dangerous than SARS-CoV-2.
 
There is a vaccine for plague. So, one wonders, why was the lab technician not vaccinated, since she would have been at high risk for acquiring the infection. Again, the top two possibilities are that the bacterium had been engineered to avoid the vaccine or we are dealing with something else entirely.

And, yes, the pneumonic type is airborne and if it comes to our shores let’s mask up with N95 respirators and not use surgical masks, since they have gaping holes along their sides. And if this is plague, a vaccine will be available or rapidly developed, possibly using mRNA technology. Our response will no doubt be hobbled by hordes of anti-vaxxers and a decimated CDC, making the Fox News report that the US “is watching the situation closely with the CDC and other federal agencies” not that reassuring.

Let’s pray this pathogen does not reach our shores, but if it does, we must be prepared and not repeat the mistakes we made during the SARS-CoV-2 pandemic; instead, we must apply the knowledge we have learned.