A study quantifies how well the original vaccines and boosters work against the Omicron variant
. The booster contains genetic sequences of Omicron BA.4/5, which now causes nearly all new infections of COVID-19. Based on the data from his study, which showed waning of protection after the primary vaccination series, Kwong anticipates that the same will happen after the first booster. If antibodies wane, then people are less protected from getting infected with the virus.
On the plus side, Kwong’s study confirmed previous data showing that vaccinated people who also received a first booster dose remain protected from getting seriously ill with COVID-19, even if they are infected with Omicron; vaccine effectiveness against severe disease was about 95% a week or more after the third dose. The new, which targets both the original and Omicron BA.4/5 variants, “is a good move for sure,” says Kwong, to improve people’s protection from getting infected.
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