To find out how long COVID boosters offer protection, CDC researchers analyzed more than 240,000 emergency department visits and 93,000 hospitalizations across 10 states.
was the most contagious COVID-19 strain. In terms of protection against hospitalization, the study found that two months after the third shot, vaccine effectiveness stood at 91%. After four months, it dropped to 78%. When it came to protection against ED or UC visits, vaccine effectiveness slipped from 87% to 66% over that same period. It is still better than no protection at all, but there is a clear decrease.
Like all studies, this one had a few limitations. The main one being that researchers only focused on people who sought medical treatment for COVID-19, meaning that COVID-19 infections that did not require medical treatment were not factored into the data. This aspect means the research could be skewed more toward immunocompromised people or older people.
So, since we know that the third shot can give us further protection against COVID-19 but that it weakens over time, this raises the question: Will we need a fourth shot? “The finding that protection conferred by mRNA vaccines waned in the months after receipt of a third vaccine dose reinforces the importance of further consideration of additional doses to sustain or improve protection against COVID-19,” researchers said in the study.
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