Can a smaller booster dose still protect against COVID-19?
NCT ID NCT05265065
First seen Jun 27, 2026 · Last updated Jun 27, 2026
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 already received two doses of Sinopharm, AstraZeneca, or Sputnik vaccines 6 to 9 months earlier. The goal was to measure immune response and side effects 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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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
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Locations
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District Health Centre
Ulaanbaatar, Mongolia