Measuring Flu Vaccine Immunity Over Time in People Ages 9 to 64 With and Without Previous COVID-19

What this Trial Is About

Researchers are studying how immunity to the flu vaccine changes over time in people who have had COVID-19, including those with other health conditions like obesity, type 2 diabetes, chronic fatigue, or long-term COVID-19 symptoms. This study includes children and adults aged 9 to 64, comparing those who had COVID-19 with those who did not. The goal is to better understand how prior COVID-19 infection affects flu vaccine response. All participants will receive one flu shot during the study. The study groups include people who have had COVID-19 and a control group without COVID-19. The flu vaccine is given once, and the immune response will be tracked over time. The study is observational and led by Stanford University. Participants will be monitored at one week and one month after vaccination to test their immune response to the flu vaccine. Assessments may include blood tests to measure immunity. The study involves several visits for these tests, and participants will be observed throughout the study period, which runs until April 2028. The study aims to collect detailed information on how immunity develops and changes after flu vaccination in people with different health backgrounds.

Understanding Immunity to the Flu Vaccine in COVID-19 Patients