Fully-vaccinated people are suffering from the same common Omicron symptoms - including a sore throat, headache and even diarrhoea.
The new variant caused concern when it first arrived, but scientists soon found Omicron symptoms milder than previous strains.
Health experts now believe Omicron has reached its peak, with coronavirus cases steadily falling in the UK.
According to the ZOE Symptom Study App, double-vaccinated people are still less than half as likely to have the virus compared to the whole population.
However, fully-vaccinated people who have caught Omicron are reporting nine main symptoms.
Professor Tim Spector, behind the ZOE Symptom Study App, confirmed: "Cold-like symptoms – including a runny nose, sore throat and persistent sneezing – became more common, along with a headache and cough, particularly in people who had been vaccinated.
"It’s causing symptoms that are much more like a regular cold, particularly in people who’ve been vaccinated, and fewer general systemic symptoms, such as nausea, muscle pains, diarrhoea and skin rashes."
The nine top signs and symptoms of the virus in the fully vaccinated who have had two jabs and then a booster shot are as follows, according to top experts:
- Runny nose
- Sore throat
- Sneezing
- Headache
- Cough
- Nausea
- Muscle pains
- Diarrhoea
- Skin rash
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