Do you have to self isolate now if you test positive for COVID?

Yes, you should try to stay at home and avoid contact with other people for 5 days after the day you took your test if you are 18 years old or over.
So .. yes. If you have COVID-19, you can pass on the virus to other people for up to 10 days from when your infection starts. But most people will no longer be infectious to others after 5 days.

The incubation period is about 5 days, i.e. you get infected from someone else about 5 days before you get symptoms. You can also be infectious for 2 days before the symptoms start, i.e. within that incubation period.

If you test positive for COVID-19 (Lateral Flow Test (LFT), or PCR), you should:

  • Self-isolate. This means try to stay at home and avoid contact with other people for 5 days. You can go for walks but try to avoid groups of people (e.g. in the supermarket)
  • Avoid meeting people at higher risk from COVID-19 for 10 days, for example elderly relatives – even if they have had a COVID-19 vaccine.

This starts from the day after you did the test. This is Day 1.

Work

Some employers will want to see two consecutive negative LFT tests, on Days 5 and 6, before you go back on Day 6. It does not help if you cause an outbreak at work and many others are then off.

Children

If a child or person aged 18 or under tests positive for COVID-19, they should try to stay at home and avoid contact with other people for 3 days. This also starts from the day after they did the test.

Summary

We have answered the question do I have to isolate now if I have COVID? The short answer is yes.