The Springfield-Greene County Health Department is vaccinating customers of a Red Robin restaurant in Springfield, MO, who may have been exposed to Hepatitis A between May 8-16. Health officials are worried that 5,000 people may have been exposed after a restaurant worker was diagnosed with the virus. In order for the vaccine to work, it must be taken within 14 days of exposure, so the department is working fast to inform the public about its vaccination clinics being held May 22-26. The restaurant now is considered safe, health department officials said. Hepatitis A is a viral infection of the liver that can result in sickness ranging from a mild illness lasting a few weeks to severe symptoms lasting several months. Symptoms include fever, fatigue, loss of appetite, nausea, vomiting, abdominal pain, dark urine, clay-colored bowel movements, joint pain, and jaundice.