Dutch Study Tracks Vaccine Effectiveness to Stop COVID-19 Household Contact Transmission

Dutch Study Tracks Vaccine Effectiveness to Stop COVID-19 Household Contact Transmission

A recent study in the Netherlands, led by scientists from the Center for Infectious Disease Control and the National Institute for Public Health and the Environment (RIVM), sought to estimate vaccine effectiveness against onward viral transmission by comparing secondary attack rates among household members between vaccinated and unvaccinated index cases. Capitalizing on contact tracing data as well as direct source material, the investigators conducted the study during the height of the Delta variant in Holland. The study team published yet-to-be peer-reviewed data suggesting that vaccine effectiveness in preventing viral transmission (from fully vaccinated to fully vaccinated) equals 40% (95% CI 20-54%). The effectiveness of full vaccination against transmission to unvaccinated household contacts equaled 63% (95% CI 46-75%). The study team reminded the reader that a previous study indicated that regarding the Alpha variant the effectiveness was 73% (95% CI 65-79%) against transmission to unvaccinated household contacts. The study was made possible by data accumulated by personnel at 25 Municipal Health Services agencies.

This Dutch observational population study...

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