That's the word from the Clark County Health District, which recorded the number of reported cases of the illness dropped to baseline levels for 28 consecutive days. Spokesman Dave Tonelli said the 28-day mark "is the amount of time that norovirus can survive on environmental surfaces" such as railings and countertops.

The sickness affected mostly visitors from Hawai'i who have made Las Vegas the state's unofficial favorite vacation destination.

Many of those visitors spend time at the California and other properties owned by Boyd Gaming. Boyd spokesman Rob Stillwell said the hotel aggressively fought the virus as soon as it became aware of the numbers.

Tonelli said the total number of cases of the disease from Dec. 1 until today was 1,697. Most of those who became ill experienced one or two days of vomiting, nausea and diarrhea.

Norovirus cannot be treated with medication. For most people, the illness goes away after a day or two of extreme discomfort, but some people have sought medical help from emergency rooms and even been hospitalized.

"Based on all the evidence we have available, the outbreak is over," Tonelli said. Stillwell said the resort has permanently adopted many of the heightened sanitation measures including use of hospital-grade disinfectant. "We've learned a lot from this experience," Stillwell said.