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“What to do if you are a close contact of someone who has had a positive test result for COVID-19
People who live in the same household as someone with COVID-19 are at the highest risk of becoming infected because they are most likely to have prolonged close contact. People who stayed overnight in the household of someone with COVID-19 while they were infectious are also at high risk.
If you are a household or overnight contact of someone who has had a positive COVID -19 test result it can take up to 10 days for your infection to develop. It is possible to pass on COVID-19 to others, even if you have no symptoms.
You can reduce the risk to other people by taking the following steps:
avoid contact with anyone you know who is at higher risk of becoming severely unwell if they are infected with COVID-19, especially those whose immune system means they are at higher risk of serious illness from COVID-19, despite vaccination
limit close contact with other people outside your household, especially in crowded, enclosed or poorly ventilated spaces*
wear a well-fitting face covering made with multiple layers or a surgical face mask if you do need to have close contact with other people, or you are in a crowded place
wash your hands frequently with soap and water or use hand sanitiser
If you develop symptoms of a respiratory infection try to stay at home and avoid contact with other people and follow the guidance for people with symptoms.”
www.gov.uk/guidance/people-with-symptoms-of-a-respiratory-infection-including-covid-19#what-to-do-if-you-have-symptoms-of-a-respiratory-infection-including-covid-19-and-have-not-taken-a-covid-19-test