Contagious Period for COVID-19

How Long Is the COVID Contagious Period?

COVID-19 is a respiratory illness caused by the SARS-CoV-2 coronavirus. It spreads mainly through infectious airborne particles and respiratory droplets released when an infected person breathes, talks, coughs, sneezes, sings, or exercises. Risk is generally higher with close or prolonged contact, especially in crowded or poorly ventilated indoor spaces. The COVID-19 contagious period varies with illness severity, duration, and immune status. People can spread the virus before symptoms begin, while they have symptoms, or without ever developing symptoms.

The incubation period is the time between exposure to the virus and the start of symptoms. It is not the same as the contagious period. Incubation varies by variant; during periods when Omicron variants predominated, symptoms typically began about 3–4 days after exposure. People with COVID-19 can be infectious about 1–2 days before symptoms begin and for roughly 8–10 days afterward, with most transmission occurring shortly before and during the first few days of symptoms. These are general ranges rather than a fixed two-week contagious period.

People with severe illness or weakened immune systems may remain infectious longer than other people and should ask a healthcare professional when it is appropriate to resume normal activities. Viral genetic material can sometimes be detected after a person is no longer infectious, so a positive molecular test does not always mean that the person can still spread live virus.

To prevent the spread of COVID-19, it is recommended to follow these guidelines:

• Stay home when sick: If you have respiratory-virus symptoms that are not better explained by another cause, stay home and away from others, including people you live with who are not sick.
  • You can resume normal activities when, for at least 24 hours, your symptoms have been getting better overall and you have not had a fever without using fever-reducing medicine.
  • If you had severe illness, have a weakened immune system, or are unsure whether it is safe to resume activities, consult a healthcare professional. If fever returns or symptoms worsen after you resume normal activities, stay home again until both criteria have been met for at least 24 hours, then restart 5 days of added precautions.
• When resuming normal activities, the CDC recommends taking added precautions for the next 5 days, particularly around people at higher risk of severe illness. These precautions include:
  • Open doors or windows to bring in fresh outdoor air, improve indoor air filtration, or gather outdoors.
  • Cover coughs and sneezes, and wash or sanitize your hands often. Cleaning frequently touched surfaces can also help, although contaminated surfaces are not considered a major route of COVID-19 spread.
  • Wear a well-fitting mask to reduce virus transmission.
  • Put physical distance between yourself and others when possible.
  • Consider testing before being around other people indoors, especially those at higher risk of severe illness. A positive test suggests that you are more likely to be able to spread the virus.

If you have symptoms, consider testing for COVID-19. If you are at higher risk of severe illness, contact a healthcare professional promptly because antiviral treatment works best when started within the first few days after symptoms begin.

Remember, these recommendations are general guidelines and may vary depending on individual circumstances. It's always best to consult with a healthcare professional for personalized advice and guidance tailored to your specific situation.