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Table 1 Seroprevalence surveys—details

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 5 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 18 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