https://consumer.healthday.com/b-6-2-it-s-the-number-of-covid-shots-you-get-not-combination-that-brings-immune-boost-2657421288.html
THURSDAY, June 2, 2022 (HealthDay News) -- The number of COVID-19 vaccine doses received — not the combinations — is the key to strengthening your immune system to protect against different variants of the coronavirus, including Omicron, a new study suggests.…
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