The plague tends to live in the past tense. It is remembered as the catastrophe that killed tens of millions of people across 14th-century Europe, a disease so devastating that it reshaped economies and societies. But the bacteria responsible never disappeared. It still circulates in the natural world, still infects people, and still appears in official case counts in Africa and the United States nearly every year.
The crucial difference today is treatment. Plague is a rare bacterial infection that responds to antibiotics, which means the outcome for a patient who is diagnosed and treated promptly is very different from what it was centuries ago. The danger has not been eliminated — but it has been made manageable.
Where Cases Still Appear
According to the World Health Organization, most human cases since the 1990s have been reported in Africa, with Congo and Madagascar accounting for a large share. That pattern reflects where people live in close proximity to rodent populations that carry the bacteria, and where surveillance systems are strong enough to detect and report infections.
The picture in the United States differs in scale but not in kind. The Centers for Disease Control and Prevention records an average of about seven human cases a year, concentrated in rural parts of the American West. Prairie dog colonies and other wild rodent populations serve as natural reservoirs, and occasional spillover into people is expected rather than anomalous.
In other words, the disease has not been pushed out of the environment. It is simply being tracked, treated and contained on a case-by-case basis.
A Scare at a Siberian Research Institute
A recent death in Russia showed how sensitive the topic remains. A worker at a plague research institute in Siberia died of pneumonia. Unconfirmed media reports raised the possibility that pneumonic plague was responsible, which prompted alarm in the country. Russian authorities said testing found no evidence of plague, but the research institute was placed under quarantine.
A 2019 photo distributed by the Irkutsk Anti-Plague Research Institute of Siberia and Far East showed institute workers inside a laboratory, a reminder that specialized facilities continue to study the organism closely.
How Plague Spreads
Bubonic plague and pneumonic plague are caused by the same organism, a bacterium called Yersinia pestis. The bacteria are maintained in nature among rodents such as rats and prairie dogs, and fleas that feed on infected animals can transmit the infection to humans when they bite.
Bubonic plague is the most common form of the illness. It produces painfully swollen lymph nodes known as buboes, most often in the groin, armpit or neck. Other symptoms include a sudden high fever, chills, headache, and pain in the abdomen, legs and arms, according to the Cleveland Clinic.
The infection can also affect other systems. Plague can attack the lymph nodes, the lungs and the blood, which is why clinicians distinguish between bubonic, pneumonic and other presentations of the disease.
Symptoms Associated With Bubonic Plague
- Sudden high fever and chills
- Headache
- Pain in the abdomen, legs or arms
- Swollen, painful lymph nodes (buboes), typically in the groin, armpit or neck
A 5,500-Year History in Siberia
Plague is not new to Siberia. People there have been dying from the disease for at least 5,500 years, and the earliest evidence of a form of the illness was identified in teeth belonging to ancient hunter-gatherers who lived north of the region's Lake Baikal. That finding pushes the bacterium's interaction with humans deep into prehistory, long before the Black Death secured its place in the historical record.
Why Eradication Is Not Realistic
Simon Clarke of the University of Reading in the United Kingdom described the situation bluntly. People assume the plague is a thing of the distant past, he said, when in fact it remains present among us. He also noted that unless the wild animals that harbor the bacteria could be removed — which is not possible — the bacteria will not be eliminated.
That reality shapes public health strategy. Rather than pursuing eradication, health agencies focus on surveillance, rapid diagnosis and antibiotic treatment, along with education for people living in areas where rodents and fleas are common. The goal is not to wipe the organism off the map, but to catch infections early enough that they never become severe.
What This Means for the Public
For most people, the practical risk remains extremely low. Cases are rare, geographically clustered and treatable. But the persistence of Yersinia pestis is a reminder that infectious diseases do not always follow the arc we assume. Some fade into history; others settle quietly into the background, waiting for the right combination of rodent, flea and human contact.
Plague belongs firmly to that second category. It is no longer a civilization-shaking event, but it is also not gone — and the steady trickle of case reports from parts of Africa and the rural American West is the clearest evidence of that.
This article is based on reporting by Medical Xpress. Read the original article.
Originally published on medicalxpress.com
