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Finding the causative mite, its ova (eggs), or scybala (feces), confirms the diagnosis, although failure to find these does not rule out scabies.
However, it is common to see a papular urticarial type response as an allergic reaction to antigens associated with the mite itself, its scybala, and eggs.
Microscopic evaluation of scrapings from the pustules revealed a female mite, ova, and fecal debris (scybala).
Ten other residents with pruritus or rash, or both, were also examined; mites, ova, or scybala were found on scraping preparations from five of the residents.