Have you been swarmed by biting flies? Why they're 'no joke'

From Rogers Park to Calumet, many people in the Chicago area are reporting a surge in flies. Are there more flies, especially ones that bite? The public health departments of Chicago and Illinois don’t track biting flies. But anecdotally, they seem ubiquitous. Social media is buzzing with people lamenting getting attacked by flies everywhere from Belmont Harbor to Logan Square. “Today at a park in West Town I got swarmed by like seven flies after sitting on the ground for less than five minutes…