The Centers for Disease Control and Prevention has temporarily suspended testing for rabies and a family of pox viruses—including smallpox and mpox—as the agency undergoes a sweeping internal review. The pause, confirmed via an update to the CDC website, has raised alarm among public health officials who rely on federal testing capacity when local laboratories lack the necessary infrastructure.
Why the Testing Halt Matters
The CDC provides specialized diagnostic services for dozens of dangerous pathogens, serving as a backstop for state and local public health labs that lack the equipment or expertise to conduct such tests. The pause in rabies testing is particularly concerning given the disease's near-100% fatality rate if untreated. Delayed diagnosis could cost lives in cases where post-exposure prophylaxis windows are tight.
Context of Agency Cuts and Reorganization
The halt follows months of significant workforce reductions at the CDC, driven by the Trump administration's broader effort to restructure federal agencies. Hundreds of scientists and public health professionals have either resigned or been let go since early 2025, depleting the agency's operational capacity. The testing review began in late 2024 as part of an agencywide evaluation of laboratory services.
Expert Concerns and Public Health Risks
Infectious disease experts warn that the suspension of mpox and smallpox-related virus testing is especially poorly timed given ongoing global mpox transmission. Any emerging cluster in the US could be misidentified or delayed in diagnosis, hampering outbreak containment. Public health advocates are calling on Congress to restore funding and staffing to the CDC's laboratory division as a matter of national biosecurity.
What Comes Next
The CDC has not provided a clear timeline for when testing services will resume. State health departments are being advised to seek alternative testing arrangements through academic medical centers or private laboratories where possible. The episode has intensified debate over the consequences of federal health infrastructure cuts on emergency preparedness and response capacity across the country.
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