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That “is not unusual for indoor spaces this time of year in Mammoth Lakes,” said Dr. Tom Boo, a public health officer for Mono County, home to Mammoth Lakes.

“We’re vulnerable,” said Dr. Lisa Hernandez, the county’s public health officer.

“Measles is a highly contagious virus that can cause severe illness such as pneumonia, brain swelling and even death, especially young kids who are not protected,” said Dr. Regina Chinsio-Kwong, Orange County health officer.

“Measles is a serious respiratory disease that spreads easily through the air and on surfaces, particularly among people who are not already protected from it,” said Muntu Davis, the Los Angeles County Health Officer.

“These recent flu deaths among our youth are tragic and concerning as we head into what historically is the peak of flu season,” Dr. Ankita Kadakia, San Diego County’s interim public health officer, said in a statement this month.