- Pfizer, BioNTech say booster shot showed high efficacy in large study
- Moscow to impose strictest lockdown measures since June 2020
- Melbourne readies to exit world's longest lockdown
- Russia reports cases of more contagious variant - reports
- U.S. FDA clears Moderna, J&J COVID-19 boosters
Special Report
Is the Amazon rainforest near a tipping point?
Three real-world studies are ominous
