<h1>Import suspension over screwworm detection prompts diplomatic dispute and tightened animal health controls affecting cross border cattle trade.</h1> The United States imposed a temporary import suspension on Mexican cattle after detecting screwworm, citing unacceptable spread and risks to livestock, while Mexico protested the measure as unfair and noted it had implemented multi front responses. The suspension follows a confirmed human case and an epidemiological warning, prompting resumption of tightened animal health controls and pre entry evaluation protocols for export cattle to prevent invasive parasitic infestation.