4th Vaccine Dose Showed Negative Relative Vaccine Efficacy Against COVID Death: Study

An Austrian study showed more COVID-19 deaths among individuals who received four vaccine doses than among those who received fewer doses or no vaccinations.

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A fourth dose of the COVID-19 vaccine may not be as effective as expected, according to a recent peer-reviewed study.

The retrospective population-based observational study published in the European Journal of Clinical Investigation used national health data from the Austrian epidemiological reporting system, individual all-cause mortality data from Statistics Austria, and the national COVID-19 vaccine registry.