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England to roll out fourth Covid shot

UK: Boosters increase protection against death from Omicron in over-50s to 95%

Studies highlight need for Covid boosters to fight Omicron

Study: 4th shot of Covid vaccine less effective on Omicron

WHO: Repeated Covid boosters not a viable strategy

Booster dose campaign kicks off Tuesday after weeklong trial run

Covid-19: Bangladesh begins booster vaccination

GSK aims for 1bn doses of booster as Covid-19 vaccine race heats up