Bourla says boosters against coronavirus will remain necessary, but anti-COVID pill 'changes everything'

This would make all Israelis over six months be eligible for vaccines; waiting on Pfizer trial, which has already indicated that shots are safe for under-5s

'That’s something that needs to be tested,' Albert Bourla says as Israel gives extra boosters to at-risk groups; adds that inoculation adapted to Omicron will be ready in March

Sweden, UK, also set new daily records as top WHO official says low hospitalization rates in South Africa are no guarantee Omicron will hit other countries as mildly

PM says those who received an extra booster in Sheba trial had five times more antibodies after a week, though much data on fourth dose remains unknown

Agency's vaccine chief says third dose for kids 12 and over 'may help provide better protection against both the Delta and Omicron variants'

Change comes after initial data from company's study finds 2-4 year olds didn't respond as expected to very low-dose shots; no safety issues found

Researchers looked at data of over 840,000 people who got booster; paper co-author says study 'unequivocally' shows value of extra dose against Delta strain

Experts doubt current vaccines will become useless in face of new variant, but virus is currently moving faster than science

Vaccine producer says it is working on a shot specifically designed for the variant that is slated to be ready in March