U.S. officials authorize 4th dose of Pfizer COVID-19 shot for Americans 50 and up | CBC News
Israel approves 4th Covid booster jab – EURACTIV.com
Pfizer CEO: Omicron Variant Could Mean Fourth Vaccine Dose Needed Sooner Than Expected
Pfizer, BioNTech find updated COVID booster protects against Omicron in trial | Reuters
Can I Get a 4th COVID-19 Vaccine Shot? Experts Share Who Will Need Second Boosters First
Omicron: Pfizer CEO says we may need fourth Covid vaccine doses sooner than expected
Efficacy of a Fourth Dose of Covid-19 mRNA Vaccine against Omicron | NEJM
COVID-19 booster after Omicron: Are 3rd or 4th shots necessary?
CDC recommends additional booster of Pfizer-BioNTech, Moderna Covid-19 vaccine for adults 50 and older - POLITICO
Here's who could get a 4th dose of the COVID-19 vaccine | wcnc.com
Fourth COVID-19 vaccine dose substantially reduces mortality in the elderly
Pfizer seeks approval for 4th COVID-19 booster dose for seniors
What a 4th COVID shot can do for you — and what it can't | CBC News
Effectiveness of a second BNT162b2 booster vaccine against hospitalization and death from COVID-19 in adults aged over 60 years | Nature Medicine
Fourth Pfizer jab ineffective in blocking Omicron, Israeli study shows
Fourth COVID vaccine dose gives 76% added protection against death | CIDRAP
Most Immunocompromised People Have Gotten the 4th COVID-19 Vaccine Dose
What We Know About Getting a Second Booster Shot of COVID-19 Vaccines | The Scientist Magazine®
Pfizer asks U.S. to approve a 4th COVID vaccine dose for seniors | PBS NewsHour
Fourth Dose of BNT162b2 mRNA Covid-19 Vaccine in a Nationwide Setting | NEJM
Moderna seeks FDA authorization for 4th dose of COVID shot | PBS NewsHour
