While a few months ago experts have been warning nations to delay booster shots, some have now changed their tune and have revealed that booster shots may be the key to strengthening the immune system.

Covid booster shots help increase immunity: Experts

As coronavirus cases continue to surge in the US, authorities on Friday approved Pfizer-BioNTech and Moderna booster shots for all those over 18. The booster doses were earlier authorised for people over 65.

US approves COVID-19 booster shots for all adults

UK's Joint Committee on Vaccination and Immunisation (JCVI) in its report suggested that booster shots need to be administered in the country with the winter approaching.

UK's vaccine body recommends virus booster shots from September; government set to decide