A "flu epidemic" refers to a widespread outbreak of the flu, a contagious illness that affects many people in a community, region, or even a whole country at the same time. Full definition
You can pretty much put a mark in your calendar for when the annual flu epidemic begins. (innovations-report.com)
This is the practice that started the Asian dog flu epidemic that is killing dogs all over the country. (blogs.bestfriends.org)
My little one is still sick believe it or not; hope you're all staying safe and being careful with this crazy flu epidemic going around. (theclosetcrush.com)