Regulatory review due to success in studies, and thanks to leap in progress made by development of mRNA COVID jab

When it comes to avoiding ‘substantial’ disease, boost was 71% effective for Pfizer, 89% for Moderna, but 4th shots give only small edge over 3-dose regimen in preventing infection

Sheba-led research team says that 6 months after boosters, 'antibody levels and cumulative vaccine efficacy do not differ between the two vaccines'

Vaccines will increase protection even though Omicron has already changed since they were developed, says Bar-Ilan epidemiologist

27-nation bloc preparing to roll out booster campaign ahead of feared wave of new cases come winter

Following CDC approval, new 'bivalent' shots -- which are half the original vaccine and half an Omicron-targeted version -- expected to roll out across America

Massachusetts-based firm accuses rival and its partner of copyright infringement, filing suit in both US and German courts

Medicines and Healthcare Regulatory Agency says it gave green light to Moderna's combo 'bivalent' vaccine, which will be used as an adult booster shot targeting Omicron variant

FDA says tweaked Pfizer and Moderna shots to be available as early as September, but urges fourth dose of existing vaccine for eligible adults

Environment reporter Sue Surkes on climate crisis solutions and her family's soccer connection; health correspondent Nathan Jeffay notes that fist bumps don't protect against COVID