The Government launching a new study tracking Covid-19 in the population to try to understand the current rate of infection and how many people have developed antibodies to the virus.
Some 20,000 households in England are being contacted to take part in the first-wave of the research, with initial findings expected in early May.
All participants will provide a nose and throat swab to test for whether or not they currently have the virus, while adults in some 1,000 of the households will provide a blood sample to find out what proportion of the population has developed antibodies to Covid-19.
The Department of Health and Social Care (DHSC), leading the study with the Office for National Statistics (ONS), said participants will form a