Doctor Cristina Menni from King’s College London said: “We observe a different clinical presentation of symptoms in those infected with Omicron compared to Delta.
“As we are moving even further away from the average patient having UK government ‘core’ symptoms ie fever, persistent cough, loss of smell, our results point to a different selection of symptoms that may indicate infection.
“To protect others, it is still important to self-isolate for five days as soon as you see any symptoms.”
Professor Ana Valdes, an honorary professor at King’s College London, said: “Although there is still a wide range of duration and severity of symptoms with Omicron, for vaccinated individuals we find on average a shorter duration of symptoms.