In the United States, Johnson & Johnson announced Tuesday that its Covid-19 booster shot is 94 percent effective when given two months after the initial dosage. It further claims that as compared to a single shot, the booster boosts antibody levels by four to six times. According to the company, a booster shot given six months after the first shot appears to be possibly even more protective against Covid, with antibodies twelvefold greater four weeks later, regardless of age.
According to, the vaccination was well accepted when given as a booster, with side effects similar to those experienced following the original dosage. Johnson & Johnson chief scientific officer Dr. Paul Stoffels said in a statement, “We now have generated evidence that a booster shot further increases protection against COVID-19 and is expected to extend the duration of protection significantly.”
The agency is likely to make a final ruling any day now. Before recommending booster shots for the Johnson & Johnson vaccine, US health officials said they needed more evidence. The booster shot has a 94 percent effectiveness rate in the United States, according to the manufacturer. According to the firm, a booster shot given two months after the first dosage is 75 percent effective against symptomatic infection worldwide. It also showed 100 percent efficacy against severe and critical disease, according to the company.