The misery of the common stomach flu may be coming to an end. Pharmaceutical company Moderna has launched a large-scale Phase III trial that will test out a vaccine against norovirus, a frequent and sometimes dangerous source of food poisoning.

A norovious outbreak at a California shelter housing Los Angeles fire evacuees has left 28 sick. The virulent illness norovirus spreads easily in close quarters, causing diarrhea, vomiting and stomach

Norovirus spreads very easily, and people may still be contagious even a week or two after recovering. The main danger is dehydration. No drugs cure norovirus.

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Health officials are raising alarms about a significant increase in norovirus cases nationwide, including here in North Texas.

First came the fires. Then, there was ash and contaminated water. Now, some survivors of the Southern California wildfires are dealing with outbreaks of norovirus and other stomach ailments at a shelter set up to help evacuees.

Rates of norovirus in that CDC system have reached levels at or above last season's peak in all regions of the country. Norovirus test positivity rates look to be the worst in the Midwest, in a grouping of states spanning Kansas through Michigan.

The Pasadena Public Health Department said they will support the American Red Cross and onsite medical teams following a Norovirus outbreak at the city's evacuation center.

The cases mark the fourth norovirus outbreak on Holland America ships since early December, following others on its Eurodam, Rotterdam and Zuiderdam vessels. Other companies, including Cunard Line and Princess Cruises also saw outbreaks in recent weeks.

Three people have tested positive for norovirus amid a cluster of 28, the Pasadena Public Health Department said on Friday.

"It is too early to tell if this strain is associated with more severe norovirus disease but likely lower population immunity is the reason for the early surge of an otherwise seasonal increase of this virus," Jan Vinjé, head of the CDC's CaliciNet system, told CBS News in an email.