Police in Columbus, Mississippi, said the incident occurred at the Jack's restaurant on Highway 45 on Jan. 7.
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Reports of the incident first gained traction on social media, and the unidentified victim ultimately contacted police as they prepared to launch an official investigation.
Over the weekend, police issued a warrant for the arrest of 18-year-old Sky Juliett Samuel, who allegedly served the tainted food, ABC affiliate WTVA-TV reports.
Samuel turned herself in Monday morning. She was booked for putting bodily fluids on food and held on $5,000 bond.
In a statement, Jack's Family Restaurants told WTVA that the company "fully supports the police department's efforts to determine if there was any wrongdoing in this case."
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The company added that it was cooperating with the investigation and had also launched an independent investigation.
"I'm glad a case has been opened on this incident to see exactly what happened," Columbus Mayor Robert Smith said in a news release. "There are laws related to tampering with food, and this is a serious issue."
The Mississippi State Department of Health was also investigating the incident.