The typical contagious period for COVID-19 is about 8 to 10 days after symptoms begin, with people being most contagious around the time symptoms start and in the first few days of illness. People can also be contagious 1 to 2 days before symptoms appear. If symptoms improve and there is no fever for at least 24 hours without medication, the contagiousness usually declines, but it's recommended to continue precautions like masking for several days after isolation. People with severe illness or weakened immune systems might be contagious for longer, sometimes up to three weeks or more. Rapid tests can help assess current contagiousness, especially before interactions with vulnerable individuals.
Key points on COVID-19 contagiousness:
- Contagious from about 1-2 days before symptoms start.
- Contagious for 8-10 days on average after symptoms begin.
- Some people, like those with severe illness or weakened immunity, can be contagious longer (up to 3 weeks).
- Isolation usually recommended for at least 5 days, then wear a mask for another 5 days.
- No fever for 24 hours without medication and symptom improvement are key signs of reduced contagiousness.
- Rapid antigen tests can help check for contagiousness especially if planning to be around others.
These guidelines are consistent with the CDC and health authorities' current recommendations as of mid-2025.
