The project recently shared an updated list of the top Covid symptoms reported by the more than 4 million users of the ZOE Covid Study app, which has tracked virus symptoms based on daily user-entered data since 2020.
Covid infections come with dozens of different potential symptoms, ranging from mild fatigue to strange ones like " Covid tongue ."
Four of the five most commonly reported symptoms, including sore throat, runny nose, persistent cough and headache, appeared across all three groups — but their prevalence varied.
The ZOE study did not account for which Covid variant caused the infections, how many infections were first-time Covid experiences, whether a user received booster doses, patient demographic information and the severity of people's symptoms.
Including booster dose data could potentially change the study's list of symptoms, and their potential duration, for people who have completed their primary vaccine series.