COVID-19 vaccines appear to help prevent transmission between household contacts, with secondary attack rates dropping from 31% to 11% if the index patient was fully vaccinated, according to a Eurosurveillance study yesterday.
The population-based data looked at the Netherlands from February to May, when the Alpha variant (B117) was dominant and the available vaccines were by Pfizer/BioNTech, AstraZeneca/Oxford, Moderna, and Johnson & Johnson."This finding underscores the importance of full vaccination of close contacts of vulnerable persons," the researchers write. "Further research is needed to determine whether the observed differences between the different vaccines are due to the small sample size or have real public health relevance."V