- Covid-19 live updates: Pfizer vaccine 90% effective against hospitalization, death six months later, study says The Washington Put up
- Johnson & Johnson asks FDA to authorize Covid-19 vaccine booster shots CNN
- J&J seeks US clearance for COVID-19 vaccine booster doses Hawaii Information Now
- Portugal to give booster COVID-19 shot to older adults Reuters
- Study shows Pfizer COVID-19 vaccine effectiveness declines after six months | TheHill The Hill
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