CDC Declines High-Volume Measles Test Amid Rising U.S. Cases, Prompting Concerns from West Coast States

The Centers for Disease Control and Prevention (CDC) has rejected a request from California and Washington to validate a high-volume measles test. This decision leaves state health officials seeking alternative methods to expand testing capacity as measles infections continue to spread across the United States. The states had sought assistance in May 2026 to utilize laboratory equipment capable of processing hundreds of samples daily, but the CDC cited 'other competing priorities' in its response.