If you have COVID, how long are you contagious?

The virus spreads through respiratory particles released when an infected person breathes, speaks, coughs or sneezes. A person can spread it before symptoms appear, and a positive test or ongoing symptoms may mean transmission is still possible. People with weakened immune systems may remain infectious for longer and need individual advice.

A lingering cough or tiredness does not by itself prove that you are still contagious. Symptoms such as loss of smell, loss of taste, joint pain or low mood can continue after the infectious phase.

Stay home while you feel acutely unwell and avoid close contact with people at higher risk. Improve ventilation, wear a well-fitting mask around others, wash your hands and do not share drinks or utensils. Follow current local public-health advice and your workplace or school requirements.

If you need medical care, call ahead and say you have COVID-19 symptoms. Consider testing when it will guide decisions about contact with others or treatment.

Seek urgent medical help for difficulty breathing, persistent chest pain or pressure, new confusion, inability to wake or stay awake, or lips or skin that look pale, grey or blue. Contact a clinician early if you are at increased risk of severe illness, because some treatments work best when started promptly.

Ask when you can safely resume close contact, whether your symptoms suggest another problem, and whether your health conditions or medicines increase your risk. Ask how to protect household members who are older, pregnant or medically vulnerable.