https://childrenshealthdefense.org/defender/aluminum-adjuvant-covid-vaccines-respiratory-disease/
#Alum, an aluminum-based adjuvant or immune-enhancer used in many #vaccines — including inactivated-virus COVID-19 vaccines — helps protect against the targeted (homologous) virus strain.
However, alum may raise infection risk from new (heterologous) virus strains, referred to as “breakthrough” infections, according to a preprint study published on Research Square.
Of the 13.5 billion COVID-19 vaccine doses administered globally, 5 billion used inactivated coronavirus as their active ingredient. Unlike the Pfizer and Moderna vaccines, inactivated-virus COVID-19 vaccines do not use mRNA. Instead, they use killed or weakened viruses to bring about the immune response.
Examples of virus-inactivated COVID-19 vaccines include China’s CoronaVac product, which was distributed in 40 countries, and the Indian COVAXIN product.