Update: Salmonella is to blame for sickening dozens of people at Firefly on Paradise, according to the Southern Nevada Health District. 

At least 39 people became ill after eating at the popular restaurant last week. 

Health officials shut down Firefly on Friday. They collected food samples from the restaurant and stool samples from patients for testing. 

Stool sample tests revealed it was Salmonella that caused the widespread illness.

The restaurant remained closed on Tuesday and will have to be reinspected before reopening. That could take several days.

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A trendy Las Vegas tapas restaurant that’s racked up hundreds of rave reviews on the website Yelp is closed after more than three dozen patrons reported food poisoning symptoms.

AP reports that Southern Nevada Health District officials said the flagship Firefly restaurant on Paradise Road was shuttered Friday and will remain closed while they run tests to try to determine the source of the outbreak.

“Everyone’s kind of devastated. This is a big deal and we take it very seriously,” said John Simmons, who owns the restaurant and two other Firefly locations in greater Las Vegas that remain open. “We’ve got to get to the bottom of it.”

Amy Irani, the district’s acting environmental health director, said 39 people who visited the restaurant last week reported symptoms, and 10 said they sought medical attention. Symptoms included diarrhea and vomiting.

Firefly is a block from the Strip and is one of Las Vegas’ most commonly reviewed restaurants, with a coveted 4 1/2-star rating on Yelp. Customers rave about the sangria and bacon-wrapped dates.