NSW Health - Are you immunocompromised and have had your 3 primary doses of a COVID-19 vaccine? You can now get a booster 4 months after your third dose. From 31 January,
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4th dose for people 50 years and up: Booster protection against omicron | Nebraska Medicine Omaha, NE
Fourth COVID-19 vaccine dose provides stronger immunity boost than third dose, shows UK study — Oxford Vaccine Group
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