Repeated Covid boosters not a viable strategy: WHO

LAS VEGAS, NEVADA - DECEMBER 21: OptimuMedicine registered nurse Allison Anderson gives Antonio Nelson of Nevada a Johnson & Johnson booster shot at a pop-up COVID-19 vaccination clinic at Larry Flynt’s Hustler Club on December 21, 2021 in Las Vegas, Nevada. AFPPIX: WHO experts warned Tuesday that repeating booster doses of the original Covid vaccines is not a viable strategy against emerging variants and called for new jabs that better protect against transmission.

The group said there could be a need to update the existing vaccines to better target emerging Covid variants, like Omicron which has spread rapidly and has been detected in 149 countries so far. It also suggested that vaccine developers should strive to create jabs that “elicit immune responses that are broad, strong, and long-lasting in order to reduce the need for successive booster doses”.Until new vaccines have been developed, the group said, “the composition of current Covid-19 vaccines may need to be updated”.

It said preliminary data indicated the existing vaccines were less effective at preventing symptomatic Covid disease in people who have contracted the Omicron variant. The UN health agency has resisted the push in a growing number of countries to roll out blanket booster programmes in the battle against new concerning variants like Omicron.

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