Defining the COVID-19 Immunity Denominator in the Mekong: a Cross-Sectional Seroprevalence Study of SARS-CoV-2 in HealthyVolunteers

Summary

Participation Requirements

Description

This is a cross-sectional study performed annually over 3 years to procure blood samples by fingerstick from healthy individuals living in the Phnom Penh area to evaluate seroprevalence to SARS-CoV-2. A mobile unit will move between various markets, schools, hospitals, clinics, parks, and other publ...

This is a cross-sectional study performed annually over 3 years to procure blood samples by fingerstick from healthy individuals living in the Phnom Penh area to evaluate seroprevalence to SARS-CoV-2. A mobile unit will move between various markets, schools, hospitals, clinics, parks, and other public places with local authority permissions. Participants with a positive result on the screening SARS-CoV-2 ELISA will be contacted via telephone (since there is not reliable mail in Cambodia) and invited to undergo an additional blood draw via venipuncture during a home visit by the mobile team within 180 days of the initial sample collection. This visit may also be conducted by CCDC/CNM/MOH study staff at a local clinic. Up to 10 of their adult household contacts will be invited to enroll and screen at this time via fingerstick for SARS-CoV-2 ELISA as part of an enriched sampling scheme to boost the probability of identifying SARSCoV- 2 immune individuals; those with positive results will be invited to undergo follow-up venipuncture as described above. Venipuncture samples will be used to study the immune responses of Cambodians to the novel coronavirus.

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