In 2023, COVID-19 is generally contagious from about 1 to 2 days before symptoms appear and remains contagious for up to 8 to 10 days after symptoms begin. People are often most contagious within the first 5 days of showing symptoms, with some studies indicating peak contagiousness around day 4 after symptom onset. After about 5 days, many individuals are no longer infectious, but some can remain contagious up to 10 days, especially if symptoms persist. Precautions such as masking and physical distancing are recommended for several days after symptoms improve to reduce transmission risk.
Details on Contagious Period
- The contagious period starts roughly 1-2 days before symptoms show, due to viral shedding occurring early.
- Contagiousness usually continues for about 8-10 days after symptoms begin.
- The peak contagious period is in the initial 5 days of symptoms when viral load is highest.
- People with severe illness or weakened immune systems might remain contagious for longer periods.
- After 10 days, most people are no longer contagious, particularly if symptoms have improved and there is no fever for at least 24 hours.
Common Guidelines in 2023
- Isolation for 5 days from symptom onset or positive test is often recommended.
- Mask-wearing and distancing are advised for a few days after isolation ends.
- Rapid antigen tests can help determine if a person is still contagious before ending isolation.
This understanding is in line with recent health authority guidance and scientific studies as of 2023-2024.
