What is a common method to test for screwworm?

The common method to test for screwworm is through culturing tissues. This method is effective because it allows for the identification of the larvae in infected tissues of an animal. Screwworms specifically infest living tissues, and culturing provides a direct way to isolate and identify the larvae responsible for the infestation. The examination of tissue cultures can reveal the presence of the larvae, confirming an infection.

Other methods, while potentially useful in broader veterinary diagnostics, do not accurately identify screwworm infestations like culturing does. Blood tests may be used for other types of infections or diseases but are not effective specifically for screwworm detection. Fecal examinations are typically utilized for gastrointestinal parasites and would not provide the necessary information regarding a screwworm infection, which occurs in the tissues rather than in feces. A physical examination for larvae can be helpful but may not always yield conclusive evidence of an infestation, as larvae can be deep within the tissue and not easily observed without further culturing.