New yellow fever vaccine shows promise in japanese adults
NCT ID NCT07222059
First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time
Summary
This study tested a yellow fever vaccine in 254 healthy adults aged 18 and older in Japan. Participants received one shot under the skin and were followed for about a month. The goal was to see if the vaccine triggers a strong immune response and is safe.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
Active substance
yellow fever vaccine (live)
What this could lead to
If successful, this could confirm that the vaccine is safe and effective for adults, supporting its use in Japan.
What could go wrong
This is a single-arm, open-label study with no comparison group, so results may not be definitive. The vaccine is already established elsewhere, so the upside is limited.
Disclaimer
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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.
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.
Contacts and locations
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Locations
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Investigational Site Number : 3920001
Takatsuki, Osaka, 569-1192, Japan
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Investigational Site Number : 3920002
Chūō, Tokyo, 103-0025, Japan
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Investigational Site Number : 3920003
Shinjuku-ku, Tokyo, 169-0072, Japan
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Investigational Site Number : 3920004
Taitō City, Tokyo, 111-0036, Japan