The influenza vaccines changes every year, and are either inactivated or live-attenuated vaccines that usually cover 3 or 4 strains of Influenza A and B. Learn more about the vaccines in this video. For more videos and questions, visit – https://www.macrophage.co. Subscribe – https://goo.gl/EMRlRa. Support us on Patreon – https://goo.gl/bhmrgJ.
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