Table 1.
Case definitions for scabies using the 2018 IACS Criteria
| Criteria Category | Used in Survey | |
|---|---|---|
| Confirmed scabies | ||
| A1: | Mites, eggs or feces on light microscopy of skin samples | No |
| A2: | Mites, eggs or feces visualized on individual using high powered imaging device | No |
| A3: | Mite visualized on individual using dermoscopy | No |
| Clinical Scabies | ||
| B1: | Presence of burrows | Yes* |
| B2: | Typical lesions affecting male genitalia | No |
| B3: | (Typical lesions) and (typical distribution) and (itch) and (contact history) | Yes |
| Suspected Scabies | ||
| C1: | (Typical lesions) and (typical distribution) and (itch) or (contact history) | Yes |
| C2: | (Atypical lesions) or (atypical distribution) and (itch) and (contact history) | Yes |
* If burrows were identified, individuals were also classified as either B3, C1, or C2, as these were not confirmed with dermoscopy
A diagnosis of scabies should only be made if other differential diagnoses are considered less likely than scabies.