Webwith febrile illness as the clinical end point, the attack rate was 2. 2% in the vaccine group and 7. 1% in the placebo group (69% efficacy).

Webvaccine effectiveness varied across outcomes, age groups, immunocompromised status, and virus type.

Webthese vaccine effectiveness (ve) studies help regularly assess the value of flu vaccination as a public health intervention.

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The results of vaccine effectiveness.

Webthis season's influenza vaccines have been 42% effective so far, according to a new interim estimate from the centers for disease control and prevention,.

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