People who are vaccinated and have had a booster shot against Covid-19 recover from symptoms from the Omicron variant more than three days earlier than those with the Delta variant, a study said.

The study also found that people with Omicron are significantly less likely to lose their sense of smell, and confirmed previous research that it is less severe, AFP reports.

To find out the differences in how Omicron and Delta make sufferers sick, researchers used a free smartphone app called ZOE on which more than 63,000 vaccinated people in Britain aged 16-99 self-reported their Covid symptoms between June 2021 and January 2022.

For those with two vaccine doses plus a booster, symptoms from Omicron lasted 4.4 days, compared to 7.7 for Delta — a difference of 3.3 days.