re: Effectiveness of the Flu Vaccine

CDC

quote:

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Among the 751 infections with influenza A viruses, 560 (75%) had been subtyped; 546 (98%) of the infections were caused by influenza A (H3N2) viruses (Table 1). The adjusted VE for all ages against influenza A (H3N2) virus infection was 47% (CI = 35%–58%) (Table 2). The adjusted, age-stratified VE point estimates were 58% for persons aged 6 months–17 years, 46% for persons aged 18–49 years, 50% for persons aged 50–64 years, and 9% for persons aged =65 years (Table 2).

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VE = vaccine effectiveness (not defined in this paper)

The last number is the one that surprises me. That's the most vulnerable population.