A study published by the United States Centers for Disease Control and Prevention (CDC) indicates that the effectiveness of the booster dose of the COVID-19 vaccine decreases markedly five months after its application.
According to the studytwo months after receiving the booster injection of the Pfizer and Moderna vaccines, the level of protection against hospitalization is 91 percent, while after three months of application it drops to 78 percent.
Five months after application, the level of protection drops to 33 percent, CDC specialists said.
Given the levels of protection observed, the CDC may recommend regular boosters every five months. However, the agency said that more studies are still required to validate the figures and issue a general recommendation.
The levels of protection after the application of a third dose were observed after examining clinical data from 93,000 hospitalizations in ten states during the waves of infections of the delta and omicron variants of the SARS-CoV-2 coronavirus.
The CDC recommended that everyone over the age of five receive a booster dose five months after completing their vaccination schedule, which in the case of biologics from Pfizer and Moderna consists of two doses.
The United States is the country with the most confirmed cases of COVID-19, with more than 77.5 million infections and more than 917,000 deaths.
Despite these figures, only 63 percent of the US population has a complete vaccination schedule.