How well do you know flu? People sick with flu will typically experience some or all of these symptoms. Review the full list of symptoms; if you or a loved one are very sick or at high risk of complications and suspect you may have flu, see your healthcare provider immediately. http://bit.ly/2lkIg5x | CDC

The efficacy of influenza vaccines developed with eggs can be reduced by egg-adaptive mutations. To avoid this reduced efficacy, influenza vaccine viruses have been developed in a mammalian canine kidney cell line. https://nej.md/3AJBcSs | The New England Journal of Medicine