Seroprevalence studies conducted in random population-representative studies are essential for measuring the spread of COVID-19 pandemic. In order to fill this critical evidence gap, researchers from IDFC Foundation undertook a statewide study in Karnataka in collaboration with the Center for Monitoring Indian Economy . The study, funded by ACT Grants, relies on a random subsample of CMIE's Consumer Pyramids Household Survey panel of households in Karnataka. In this population-representative sample, the study tested for presence of antibodies (using ELISA tests that are specific for COVID-19) as well as pooled RT-PCR tests for current infections.

The findings of the study suggest that the epidemic had already infected over 45% of the state’s population by August. Importantly, the evidence also implies that rural areas have been almost equally affected by the epidemic.

You can find the study here.