California is battling one of its largest measles outbreaks in nearly a decade after new cases in Sacramento pushed the state ...

California in 2026 has already seen its highest number of annual measles cases in seven years. The looming new domestic beachhead comes as vaccination rates have fallen.

Several counties in California have faced or are currently facing measles outbreaks in 2026. How does measles spread?

Infections of COVID-19 are growing or likely growing in half of the U.S. as of July 8, according to CDC estimates.

Rotavirus, a highly contagious intestinal virus, has been detected in high concentrations in five California areas.