A study conducted in the United States indicates how long protection from the COVID-19 vaccine lasts after receiving a booster dose.
To present, scientific research has demonstrated that vaccine efficacy diminishes after two doses, but only a small amount of information has been published on the length of protection following the third booster dosage.

According to a new study released Friday by the Centers for Disease Control and Prevention in the United States, the effectiveness of the third dosage of Pfizer and Moderna against coronavirus is dramatically diminished by the fourth month after getting the vaccine, according to the study (CDC).

To present, scientific research has demonstrated that vaccine efficacy diminishes after two doses, but only a small amount of information has been published on the length of protection following the third booster dosage.

Approximately 241,204 emergency department visits and 93,408 hospitalizations of individuals with covida-19 symptoms occurred between August 26, 2021 and January 22, 2022, according to the findings of the current study.
To determine vaccine efficacy, a comparison was made between the probability of a positive coronavirus test in vaccinated and unvaccinated patients, with controls for calendar week, geographic area, adjusted for age and local transmission level, and patient characteristics such as comorbidities included in the analysis.

According to results from participants who visited the emergency room with COVID-19-like symptoms during the omicron-dominant period, vaccination efficacy increased to 87 percent during the first two months following the third dose, but declined to 66 percent by the fourth month.

When administered in three doses, the hospitalized vaccine was successful in 91 percent of cases in the first two months, but by the fourth month, the efficiency had declined to 78 percent.
As a result of their findings, the scientists concluded that the protection conferred by messenger RNA-based vaccinations deteriorated in the months following the third dose of the vaccine, highlighting the significance of contemplating further doses in order to maintain or improve protection.

President Joe Biden's senior medical adviser, Anthony Fauci, said a fourth dose of COVID-19 was likely to be required for subgroups of people with lower immune responses, such as the elderly and the immunocompromised, during a White House briefing on the virus on Wednesday.

In a decision issued on Friday, the US Food and Drug Administration (FDA) authorized bebtelovab, a new medication based on laboratory-produced antibodies developed by the pharmaceutical company Lilly.