Acute Respiratory Infection (ARI) is an infection affecting the lungs and airways, ranging from mild colds to severe pneumonia. It's primarily caused by viruses (e.g., influenza, rhinoviruses), but bacteria and other pathogens can also be responsible. ARI is a leading cause of illness worldwide, particularly impacting young children, the elderly, and immunocompromised individuals.
Transmission methods vary. Please consult CDC or WHO resources for specific information.
Contagious Period: Varies by disease
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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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