Why Two Doses of COVID-19 Vaccine for Pfizer and Moderna?

Why Two Doses of COVID-19 Vaccine for Pfizer and Moderna?

For both the Pfizer-BioNTech and Moderna vaccine, there’s a waiting period between the first and second dose. Moderna In a report submitted to the FDA, researchers discussed vaccine effectiveness in clinical trial participants who’d only gotten one dose of the vaccine. Pfizer-BioNTech Pfizer-BioNTech immunity Researchers working on the Pfizer-BioNTech vaccine clinical trial looked at vaccine effectiveness 7 days after the second dose. Moderna Moderna immunity Investigators working on the Moderna clinical trial evaluated vaccine effectiveness 14 days after trial participants had gotten their second dose. Researchers also published a separate study of the immune response to the Moderna vaccine 90 days after the second dose.

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