What is one of the recommended ways to test for screwworm in animals?

Visual inspections of skin are recommended as a method to test for screwworm in animals primarily because this approach allows for the direct observation of key signs associated with an infestation. Screwworms, particularly the New World screwworm (Cochliomyia hominivorax), lay their eggs on open wounds or sores of living animals. When the larvae hatch, they feed on the living flesh, which can lead to noticeable symptoms such as lesions, swelling, and the presence of larvae at the wound site.

Conducting a visual inspection enables a trained observer to identify these signs quickly and efficiently, facilitating prompt treatment and control measures to prevent further complications for the animal and spread to other livestock. Effective management of screwworm infestations relies heavily on such observations, as early detection can be crucial for animal health and to limit economic losses in agricultural settings.

Other methods, while potentially useful in broader diagnostic contexts, do not provide the immediate, visible indicators that are often critical in controlling this particular pest.