Massive flu vaccine safety check finds no major red flags

NCT ID NCT07332689

Completed Prevention Sponsor: Ab&B Bio-tech Co., Ltd.JS Source: ClinicalTrials.gov ↗

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.

This is an AI summary of the original study and may miss details. Read our disclaimer.

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Conditions

The condition(s) this trial relates to.

influenza prevention target

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

INFLUENZA VACCINE

Contacts and locations

Locations

Gansu Provincial Center for Disease Control and Prevention

Lanzhou, Gansu, 730000, China
Guangdong Provincial Institute of Biological Products and Materia Medica

Guangzhou, Guangdong, 510440, China
Hubei Provincial Center for Disease Control and Prevention

Wuhan, Hubei, 430079, China
Jiangsu Provincial Academy of Preventive Medicine

Nanjing, Jiangsu, 210009, China
Qinghai Provincial Center for Disease Control and Prevention

Xining, Qinghai, 810007, China
Shandong Center for Disease Control and Prevention

Jinan, Shandong, 250014, China
Shanghai Municipal Center for Disease Control and Prevention

Shanghai, Shanghai Municipality, 200336, China
Xinjiang Uygur Autonomous Region Center for Disease Control and Prevention

Ürümqi, Xinjiang Uygur Autonomous Region, 830002, China

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