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Immunogenicity of Twice-annual Influenza Vaccination in Older Adults in Hong Kong (RETAIN)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT02957890
Recruitment Status : Active, not recruiting
First Posted : November 8, 2016
Last Update Posted : September 22, 2021
Centers for Disease Control and Prevention
Hospital Authority, Hong Kong
Information provided by (Responsible Party):
Dr. Benjamin John Cowling, The University of Hong Kong

No Study Results Posted on ClinicalTrials.gov for this Study
Recruitment Status : Active, not recruiting
Estimated Primary Completion Date : September 2025
Estimated Study Completion Date : September 2026