Anyone who has ever tried to scrape the foot of a crying and kicking infant will welcome the possibility of using simple packing tape instead of a scalpel to find mites. Given the problem of trying to find mites, eggs, or scybala, especially in children, many practitioners diagnose scabies clinically1,2 and treat even if neither mite nor products can be found.
Albrecht J, Bigby M. Testing a TestCritical Appraisal of Tests for Diagnosing Scabies. Arch Dermatol. 2011;147(4):494-497. doi:10.1001/archdermatol.2011.59