The COVIDENCE UK Research Study has been developed in response to the outbreak of coronavirus (COVID-19). People aged 16 and over from all parts of the UK and from all walks of life will be asked to provide some baseline information about their lifestyle and health using an online questionnaire. They will then be contacted once a month to check if they have developed symptoms of coronavirus infection or if they have attended a hospital for treatment. The data they provide will be linked to their medical records, to allow the study team to investigate whether coronavirus infection may affect long-term health. No individual will be recognisable from the data and all information will be strictly confidential. People can take part if they have already had definite or suspected COVID-19, or if they haven’t had any suspicious symptoms.