California is battling one of its largest measles outbreaks in nearly a decade after new cases in Sacramento pushed the state’s total to 39. The outbreak, which began in Sacramento and Placer counties two months ago, has added 17 new cases — including four reported last week — state health officials confirmed Tuesday, the San Francisco Chronicle reported . The incubation period for measles — the time between exposure and the onset of symptoms — typically ranges from 10 to 14 days. Most people