From: The burden of COVID-19 infection in a rural Tamil Nadu community
 | Timing | Sampling strategy | Target group |
---|---|---|---|
Seroprevalence survey 1 | July 6th to August 20th, 2020 | 150 randomly selected households (15 households from each of 10 randomly selected clusters) | All individuals above 5Â years of age |
Seroprevalence survey 2 | November 16th to 20th 2020 | 20 randomly selected households (20 households from each of 10 randomly selected clusters) | All adults 18Â years of age or over |
Family contact seroprevalence survey | July 6th to September 15th 2020 | Approached all households 14 days after the diagnosis in the fever clinic index case; sampled consenting family contacts but excluded those who were known to be RTPCR positive | Individuals living in households of PCR-positive participants from fever clinic, including children above 5 years—788 contacts identified |