Could a smaller booster dose still protect against COVID-19?
NCT ID NCT05265065
First seen Mar 10, 2026 · Last updated May 23, 2026 · Updated 11 times
Summary
This study looked at whether a smaller (fractional) dose of the Pfizer-BioNTech COVID-19 booster works as well as the standard dose. It involved 601 healthy adults in Mongolia who had received two doses of Sinopharm, AstraZeneca, or Sputnik vaccines 6 to 9 months earlier. Researchers measured immune responses and side effects 28 days after the booster.
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Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Contacts and locations
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Locations
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District Health Centre
Ulaanbaatar, Mongolia
Conditions
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