The new Omicron variant of coronavirus is spreading rapidly in the UK. So what are the symptoms people should act on?
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The NHS says people should still look out for classic Covid symptoms:
a new, continuous cough
a fever/high temperature
loss of or change to smell or taste
But researchers say for some people, having Covid can feel "more like a bad cold" with symptoms such as a headache, sore throat and a runny nose.
The Zoe Covid study app asks hundreds of thousands of people to log their symptoms and the investigators have been looking at ones linked to both the dominant Delta variant and the new highly spreadable variant Omicron.
So far, the top five symptoms are:
runny nose
headache
fatigue (either mild or severe)
sneezing
sore throat
If you think you may have Covid, it is important to get tested. Even people who don't feel very ill can put others at risk.