IntroductionThe prime-boost COVID-19 mRNA vaccination strategy has proven to be effective against severe COVID-19 disease and death. However. concerns have been raised due to decreasing neutralizing antibody levels after COVID-19 vaccination and due to the emergence of new immuno-evasive SARS-CoV-2 variants that may require additional booster vaccinations. MethodsIn this study. https://www.adaptsurvival.com/product-category/spray-per-ambiente/