The Joplin Health Department is notifying Joplin area residents of an alert from the Springfield-Greene County Health Department about a Springfield restaurant employee who has been diagnosed with hepatitis A and was working while possibly contagious. As many as 5,000 people who between May 8 and 16 ate at the Red Robin restaurant, located at 3720 S. Glenstone Ave. in Springfield, might have been exposed to the virus.