https://www.usatoday.com/story/news/nation-now/2018/05/29/hepatitis-outb...

"The virus can be spread through food or water contaminated with the feces of an infected person, close contact or sex with a person who has hepatitis A or touching a surface contaminated by the virus and then touching your mouth. It causes liver inflammation — and liver failure in extreme cases.

It's also easily preventable through vaccination and hand washing.  

As of Wednesday before Memorial Day, the hardest hit areas are Macomb County, north of Detroit, with 220 cases; Detroit itself with 170; elsewhere in Wayne County, where Detroit is located, with 144; and Oakland County, to the west of Macomb County where Pontiac is located, with 114 cases, according to the Michigan Department of Health & Human Services. 

Part of the problem: As many as 35 restaurant workers in the Detroit area were found to have the virus and may have spread it unknowingly to diners. The virus is contagious weeks before a person begins to exhibit symptoms, which makes it extremely challenging for public health officials to manage."

Indiana's Department of Health has issued travel warning.