Flu vaccine under the microscope: does it protect hospitalized patients?

NCT ID NCT01764152

First seen Jun 26, 2026 · Last updated Jun 26, 2026

Summary

This completed study looked at how well the seasonal flu vaccine worked during the 2012-2013 flu season in adults who were hospitalized with flu-like symptoms. Researchers compared vaccinated and unvaccinated patients across a network of French hospitals to see if the vaccine reduced confirmed flu cases. The goal was to measure vaccine effectiveness in a real-world hospital setting.

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Conditions

The condition(s) this trial relates to.

influenza

As listed by the trial registrant

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

Contacts and locations

Locations

  • Institut National de la Santé Et de la Recherche Médicale

    Paris, 75654, France