Measles cases have surpassed 650 in an ongoing multistate outbreak, but federal funding cuts could threaten the response.

With cuts at the Centers for Disease Control and Prevention, Texas and other states will have to spend more on public health. The biggest expense of a measles outbreak is the public health response in shutting down the outbreak.

Texas health officials reported 36 new measles cases Friday, bringing the total number of confirmed cases since late January to 597. The state’s public health department estimates that fewer than 30 of the confirmed cases — about 4% — are “actively infectious.