COVID-19
Understand covid-19 through a concise source-checked overview, clear reporting context and direct links to official public-health information.
What it is
COVID-19 is caused by SARS-CoV-2. It commonly affects the respiratory system, although illness can also affect other parts of the body. Some people develop lasting symptoms after the initial infection.
Transmission and recognition
The virus spreads in droplets and smaller particles released by an infected person. Infection can spread when symptoms are mild or absent. Symptoms can resemble other respiratory illnesses, so a headline or symptom list cannot establish a diagnosis.
Prevention and care context
Older people, people with weakened immune systems and some people with underlying conditions face greater risks of severe illness. Current prevention and clinical advice should come from the relevant health authority and a qualified professional.
How to read outbreak reporting
A cumulative pandemic total, a weekly surveillance estimate and a hospital admission count describe different things. Check the population, period and case definition before comparing COVID-19 figures. This reference page does not provide a live case total.
Sources & Verification
AI-assisted research and writing. Source checks do not represent clinical review.
- CDC: COVID-19 Verify original (opens in a new tab)
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