As per a Zoe COVID Symptom study, fatigue is the most common sign of coronavirus infection in kids, followed by headache, sore throat, runny nose and sneezing. The Zoe COVID study is a smartphone app developed during the pandemic to log how people across the UK felt daily when suffering from coronavirus. The app is used by both kids and adults to track the symptoms, based on which the researchers have prepared the list of the common Omicron symptoms. As per the data available from the app, the symptoms seen in adults were different from kids. It also revealed that, in adults, runny nose is the first sign, followed by headache, fatigue and sneezing.