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.

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

Illness typically lasts for one to three days but people can still be contagious after their symptoms have subsided.

Multiple norovirus outbreaks have been reported in Chicago during the month of January, the Chicago Department of Public Health confirmed this week. According to the city’s health department, while individual cases are not typically reported,