Which flu shot works best for seniors? hong kong study seeks answers
NCT ID NCT03330132
First seen May 24, 2026 · Last updated Jun 24, 2026 · Updated 8 times
Summary
This study tested several types of flu vaccines in over 1,800 adults aged 65-82 in Hong Kong over four years. The goal was to see which vaccine or combination of vaccines provides the strongest and longest-lasting immune protection. Researchers measured antibody levels and immune cell responses to find the best annual vaccination strategy for older adults.
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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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The University of Hong Kong
Hong Kong, China
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
Active substance
Influenza vaccines (standard, adjuvanted, high-dose, and recombinant)
What this could lead to
If successful, this could identify a more effective annual flu vaccination strategy for older adults, reducing flu cases and complications.
What could go wrong
This is a completed Phase 4 trial, so results are available but may not apply to other regions or age groups. Different flu strains each year could also affect how well the findings hold up.
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.