Fever is an elevation of the body's core temperature above its normal range (typically >100.4°F or 38°C). It is a common physiological response, often indicating that the body is fighting an infection caused by viruses, bacteria, or other pathogens, or responding to inflammation. Everyone can experience fever, regardless of age or location.
Transmission methods vary. Please consult CDC or WHO resources for specific information.
Contagious Period: Varies by disease
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Our AI-powered surveillance hasn't detected significant Fever activity in the past 30 days.
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Currently, Fever case counts are within baseline expectations globally. However, diseases can emerge rapidly, which is why continuous monitoring is critical.
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Trusted information from leading health organizations
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: 2026-03-05
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