Officials said as many as 4,000 people ate at the restaurant over that 10-day period.
Officials said the employee who tested positive for hepatitis A handled food and that’s why others may have been exposed.
The health department found out Monday that the employee was diagnosed with the liver disease but waited until Tuesday to notify the public.
"We really didn't have all the information yesterday, and had we talked to the state yesterday it really wouldn't have changed our timeframe," Harris said.
The Hardee's restaurant voluntarily closed Tuesday afternoon.
WSOC-TV spoke to one customer who said he ate there Tuesday morning and was trying to get some answers.
"They said it was precautionary. They're cleaning things up. They said I should be okay, but I am still going to call my doctor," customer Darren Brown said.
According to the CDC, the vaccine must be given within 14 days of exposure for it to be effective.
The health department said anyone who dined at the involved Hardee's location on June 13 and 14 should get a vaccination within the next two days.
Officials said they are setting up a hotline for staff to answer questions about the potential exposure, but the number isn't available yet.
You can find more information about hepatitis A on the Mecklenburg County Health Department website.