Brulte said he believes one staffer brought the virus to Ohio from California and then passed it to the staffer's spouse. Soon, 12 of the 36 staffers were sick.
The infected individuals first began showing symptoms on Thursday, and Erie County health officials have taken fecal samples for analysis, the Plain Dealer reported.
State party officials alerted the delegation Monday morning to the norovirus outbreak and briefed attendees again Tuesday. They also informed Ohio health officials.
"We will continue to follow all county health department directives to keep the illness from spreading. We wish our staffers a speedy recovery," Kaitlyn MacGregor, executive director of the California GOP, said in an email to The Post.
They have instructed delegates to wash their hands frequently, use sanitizers, and avoid shaking hands (something, as it happens, that Donald Trump has long been loath to do). They also should not share food, and have been told to stay off delegation buses to the convention arena if they exhibit any symptoms of norovrius.
"We worked with the hotel to add sanitizing stations in and around the area where our delegation activities are. Where we pick up credentials, where we have our delegation meetings in the morning, where we have our meal functions in the morning or our parties at night," Brulte said.
The virus can be caught through contact from infected people or surfaces, or through consuming contaminated food or water. Norovirus inflames the stomach, the intestines, or both. Symptoms include stomach pain, nausea, diarrhea and vomiting. Such symptoms can be especially dangerous for young children and older adults.
Every year, about 19 to 21 million people become sick with norovirus; about 570 to 800 people die annually from it, according to the CDC.
In Ohio, hand sanitizer dispensers were spotted Monday night at the resort where the California delegates are staying, the Los Angeles Times reported.
"We worked with the hotel to add sanitizing stations in and around the area where our delegation activities," Brulte said.
The African-themed Kalahari Resort in Sandusky has 884 guest rooms, according to a company website. The property features indoor and outdoor water parks and an outdoor adventure park.
A spokeswoman for Kalahari Resorts said the company is cooperating "with all necessary officials."
"In preparation for the Republican California Delegates' stay, Kalahari Resorts and Conventions worked diligently with government officials to ensure we exceeded all health and sanitation requirements and protocols," spokeswoman Samantha Flynn said in a statement. "This includes passing extensive testing prior to, and continuing through, the delegation's visit."
The California delegation includes 172 delegates and 168 alternates, plus a number of guests, with the entire group numbering about 500, Brulte said.
Of the ailing staffers, Brulte said, "Most of them are disappointed they can't work, but they understand that they're out of circulation" until they are symptom-free for at least 24 hours.
"We're in touch with the California delegation about this," Audrey Scagnelli, spokeswoman for the RNC. "They're working with local health officials and are taking all the necessary precautions to contain the virus. We'll continue to monitor the situation and ensure the delegation and staff have everything they need."
News reports of the California delegation's remote accommodations in Sandusky surfaced earlier this year, when state GOP leaders complained that they were being put up so far from the convention site.
The complaints prompted convention organizers to bristle at suggestions they had dropped the ball on accommodating the GOP's largest delegation, or that the California delegates were being penalised for coming from a state that hasn't historically been friendly to Republicans.
