A further 1,000 households in Jersey are to be tested to see if they have already had coronavirus.
It will be the second such study of a statistically robust sample of households to plot the spread of Covid-19.
The first, at the start of May, showed around 3,300 people had already contracted the virus.
A new team of workers will be used to sign up households from more difficult to reach communities, to increase the percentage of those invited actually turning up for the testing.
I will take place from Saturday 30 May to Tuesday 2 June at testing sites based at Springfield and Les Quennevais.
It comes as the government increases its testing capacity, so it is able to test and process up to 3,500 people per week with the swab tests which show whether people currently have Covid-19, and 2,500 people per week with antibody tests which show whether they have previously had it.
The results will be processed and published by Statistics Jersey.