Do you need a 4th dose of a COVID-19 vaccine? There's no one-size-fits-all answer | CBC News
CE appeals to people aged 60 or above to get fourth COVID-19 vaccine dose (with photos/video)
Israel tests 4th Covid vaccine dose, awaits ministry green light
Fourth COVID vaccine dose gives 76% added protection against death | CIDRAP
Pfizer Asks US to Allow 4th COVID Vaccine Dose for Seniors
Do I Need A Fourth Dose of the COVID-19 Vaccine? - CHCCC
Effectiveness of heterologous third and fourth dose COVID-19 vaccine schedules for SARS-CoV-2 infection during delta and omicron predominance in Thailand: A test-negative, case-control study - The Lancet Regional Health - Southeast Asia
Health-Worker Risks Of Catching Omicron Half As Likely After Fourth Dose - Second Israeli Study Challenges Earlier Results - Health Policy Watch
Covid: Fourth-dose jab trial shows good boost - BBC News
Israeli trial, world's first, finds 4th dose 'not good enough' against Omicron | The Times of Israel
EU health agencies: fourth COVID dose only for over 80s and immunocompromised – EURACTIV.com
What a 4th COVID shot can do for you — and what it can't | CBC News
Fourth COVID-19 vaccine dose provides stronger immunity boost than third dose, shows UK study — Oxford Vaccine Group
Fourth COVID-19 vaccine dose provides stronger immunity boost than third dose, shows UK study | NIHR
Fourth COVID-19 vaccine dose substantially reduces mortality in the elderly
Immunogenicity, efficacy, and safety of BNT162b2 or mRNA1273 fourth dose
RACGP - ATAGI approves fourth dose for severely immunocompromised
Most Immunocompromised People Have Gotten the 4th COVID-19 Vaccine Dose
Covid-19: Israel plans to give fourth dose of vaccine to over-60s - BBC News
Israel studies fourth coronavirus vaccine dose in world-first trial - The Washington Post
Israel Gives Fourth 4th Shot of Covid Vaccine - Bloomberg
