TL;DR
A study of over 1.1 million Californians found that receiving a flu shot reduced the likelihood of testing positive for influenza by 40%. The research also indicated vaccines decreased flu-related deaths among seniors. The findings reinforce the importance of annual vaccination, especially during severe flu seasons.
A new study confirms that individuals who received flu shots during the 2024-25 season were 40% less likely to test positive for influenza than unvaccinated people, highlighting the vaccine’s effectiveness amid a high-severity flu season.
The research analyzed data from more than 1.1 million Californians tested for influenza between October 1, 2024, and May 31, 2025, a period marked as a “high severity” flu season with the highest hospitalization rates in 24 years. The study found that vaccinated individuals had a 40% lower likelihood of testing positive for flu compared to those unvaccinated.
Additionally, among adults aged 65 and older who contracted influenza, those vaccinated were 29% less likely to die from flu-related causes within 30 days of testing positive, according to the study published in JAMA Network Open. The season saw an estimated 610,000 to 1.3 million hospitalizations and between 27,000 to 130,000 deaths, with children notably impacted, surpassing previous records from the 2009-2010 H1N1 epidemic.
Impact of Flu Vaccination on Public Health Outcomes
The findings underscore the critical role of annual flu vaccination in reducing both infection rates and severe outcomes, including death, especially during severe flu seasons. This evidence supports ongoing public health campaigns promoting vaccination to mitigate healthcare burdens and save lives.
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2024-25 Flu Season and Vaccination Effectiveness Data
The 2024-25 flu season was classified as “high severity,” with the highest hospitalization rates in over two decades. The season saw a surge in flu-related hospitalizations and deaths, prompting increased vaccination efforts. Prior studies have established flu vaccines as a key tool in preventing severe illness, but this study provides robust, recent evidence of their effectiveness in a challenging season.
“These results demonstrate that flu vaccines provide significant protection against testing positive for influenza and can reduce severe outcomes among older adults.”
— an anonymous researcher
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Unanswered Questions About Vaccine Effectiveness and Variability
While the study confirms a 40% reduction in positive flu tests among vaccinated individuals, it remains unclear how vaccine effectiveness varies across different demographic groups or geographic regions. Further research is needed to understand the impact of vaccine strain matching and individual health factors on these results.
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Monitoring Future Seasons and Vaccine Development
Public health officials will continue to monitor flu activity and vaccine performance in upcoming seasons. Additional studies are expected to explore factors influencing vaccine effectiveness and to improve vaccination strategies, especially for vulnerable populations.
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Key Questions
How effective are flu vaccines overall?
Flu vaccines are generally effective at reducing the risk of testing positive for influenza and can lower the severity of illness and risk of death, particularly among high-risk groups like seniors.
Does the vaccine protect against all flu strains?
Flu vaccines are formulated annually to match circulating strains, but their effectiveness can vary depending on how well the vaccine strains match the viruses in circulation.
Should everyone get a flu shot?
Public health authorities recommend annual flu vaccination for most people aged 6 months and older to reduce illness, hospitalizations, and death, especially during severe seasons.
Are flu vaccines safe?
Yes, flu vaccines are extensively tested and monitored for safety. Common side effects are mild and include soreness at the injection site or low-grade fever.
What is the impact of vaccination on flu-related deaths?
The study indicates that vaccination reduces the risk of death from influenza among older adults by approximately 29% during high-severity seasons.
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