COVID-19 is an infectious disease caused by the SARS-CoV-2 virus. The virus can continue to circulate even though the global emergency phase of the pandemic has ended. The level of risk varies over time and between communities.
How the virus spreads
SARS-CoV-2 spreads mainly through infectious respiratory particles released when an infected person breathes, speaks, sings, coughs or sneezes. Risk is generally higher during close contact and in crowded or poorly ventilated indoor spaces. People may transmit the virus before they realize they are ill, and some infections cause few or no noticeable symptoms.
Why indoor air matters
Airflow and ventilation influence how respiratory particles build up in shared spaces. Opening windows when practical, improving ventilation and using well-maintained filtration can reduce exposure in some settings. The most appropriate steps depend on the building and circumstances.
Who may face greater risk
Older adults, people with certain underlying health conditions and people with weakened immune systems may be more likely to develop severe illness. Risk is individual, so people with concerns should discuss prevention and care plans with a healthcare professional.
Where to find current information
Guidance differs by country and changes as evidence develops. Review the World Health Organization COVID-19 fact sheet and your local public health authority for current information.
Remember: This article is educational and is not a substitute for medical advice.