California health departments are fighting to contain measles outbreaks as cases rise and resources shrink. Investigating communicable diseases is time-intensive and expensive. Officials say teams have about 72 hours after a positive case to find exposed people and stop spread. Nurses trace contacts, order quarantine, or give post-exposure medicine. They then monitor people for 21 days. Experts say measles spreads fast and hangs in the air for hours. California has high vaccination rates overall, but unvaccinated pockets drive outbreaks. The outbreaks are occurring as local health departments also face major funding cuts and staffing losses.