Massive flu vaccine safety check finds no major red flags
NCT ID NCT07332689
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study checked the safety of a quadrivalent flu vaccine in over 42,800 people aged 3 and older. Researchers looked for side effects within 30 minutes, 7 days, and 28 days after vaccination. The goal was to find any very rare adverse reactions. Results help confirm the vaccine's safety for widespread use.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
Active substance
quadrivalent subunit influenza vaccine
What this could lead to
If successful, this study confirms the vaccine's safety in a large population, supporting its continued use to prevent flu.
What could go wrong
This is a completed safety study, not a test of effectiveness. Rare side effects may still emerge in even larger populations.
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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Gansu Provincial Center for Disease Control and Prevention
Lanzhou, Gansu, 730000, China
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Guangdong Provincial Institute of Biological Products and Materia Medica
Guangzhou, Guangdong, 510440, China
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Hubei Provincial Center for Disease Control and Prevention
Wuhan, Hubei, 430079, China
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Jiangsu Provincial Academy of Preventive Medicine
Nanjing, Jiangsu, 210009, China
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Qinghai Provincial Center for Disease Control and Prevention
Xining, Qinghai, 810007, China
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Shandong Center for Disease Control and Prevention
Jinan, Shandong, 250014, China
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Shanghai Municipal Center for Disease Control and Prevention
Shanghai, Shanghai Municipality, 200336, China
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Xinjiang Uygur Autonomous Region Center for Disease Control and Prevention
Ürümqi, Xinjiang Uygur Autonomous Region, 830002, China