Plague is a severe bacterial infection caused by *Yersinia pestis*. It primarily affects rodents but can be transmitted to humans, often leading to serious illness if not treated quickly. It is most common in rural and semi-rural areas of Africa, Asia, and the Americas. Track Plague activity and outbreaks specific to Oregon.
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Plague has historically caused devastating pandemics, most notably the 'Black Death' in the 14th century, which killed an estimated 30-50% of Europe's population. The causative bacterium, *Yersinia pestis*, was identified by Alexandre Yersin in 1894 during the Hong Kong pandemic, greatly advancing understanding and treatment of the disease. Its history underscores its profound impact on human civilization and public health.
Plague primarily spreads through the bites of infected fleas that have fed on infected rodents. Direct contact with infected animal tissues or fluids, such as during hunting or butchering, can also transmit the disease. Pneumonic plague can uniquely spread from person to person through respiratory droplets when an infected individual coughs.
Contagious Period: Varies by disease
Local health department information and state-specific prevention guidance
Our AI-powered surveillance continuously monitors Plague activity across Oregon. We track data from state health departments, local hospitals, CDC reports, and 50+ global health sources to provide early warning of emerging threats.
Get instant push notifications when Plague activity increases in Oregon or your specific county.
For official state health alerts, vaccination locations, and public health guidance specific to Oregon, visit your state health department's website.
Whether you live in Oregon, are traveling there, or have family in the state, understanding Plague prevention is essential. Follow these evidence-based prevention measures:
If you experience symptoms of Plague in Oregon, contact your healthcare provider immediately. Early diagnosis and treatment improve outcomes significantly.
Emergency symptoms: If you experience severe symptoms, difficulty breathing, or signs of dehydration, call 911 or go to your nearest emergency room.
Trusted information from leading health organizations
Official guidance from the U.S. Centers for Disease Control and Prevention
View CDC Resources →Global disease surveillance and guidelines from the World Health Organization
View WHO Resources →Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.
Last reviewed: 2026-06-03
No confirmed cases reported in Oregon yet. Here are the latest Plague reports from our global surveillance network.
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