Page 1520 - Clinical Small Animal Internal Medicine

1458 Section 12 Skin and Ear Diseases

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Figure 165.14 Trichoscopy from a cat with Lynxacarus radovsky
Figure 165.12 Cat with Lynxacarus radovsky infestation showing a infestation. Note multiple mites attached to the hair shaft. Source:
“salt‐and‐pepper” hair coat appearance. Source: Courtesy of Courtesy of Dr Clarissa Pimentel de Souza.
Dr Clarissa Pimentel de Souza.

mites have a long body and ventrally oriented head. 3–4 treatments. Ivermectin or doramectin can also be
Sternal extensions attach to the host’s hair and the legs given at 0.2–0.3 mg/kg SC every 1–2 weeks for 3–4 treat-
have terminal suckers (Figure 165.13). These mites are ments. Ivermectin can also be given at this dosage orally.
visualized attached to the hairs (Figure 165.14). Fluralaner (Bravecto) given off-label at a single dosage of
25–50 mg/kg PO or two topical applications of moxidec-
tin/imidacloprid (Advantage Multi for cats) spot‐on
Therapy
product two weeks apart has been shown to eradicate
Most parasiticidal treatments are effective. More effica- the mites. Care must be taken when treating cats with
cious options include lime sulfur dips or insecticidal certain parasiticidal topicals, especially those that con-
sprays such as fipronil, applied weekly to biweekly for tain >0.1% permethrin, as this compound is toxic to cats.
It is suggested that in‐contact cats also be treated.

Dermanyssus gallinae

Etiology/Pathophysiology
This mite primarily affects poultry but is contagious to
other animals including dogs, cats, and humans. It is a
vector of many significant diseases. Other names are the
poultry mite or red mite. These mites spend most of
their life span off the fowl host, residing in cracks, crev-
ices, and nests within the poultry house. They feed at
night and once fed and engorged, they develop the red
coloration. Poultry mites are resilient and can survive up
to eight months away from fowl.

History and Clinical Signs
Dogs and cats can be attacked by these mites when in
contact with poultry houses or from wild birds that enter
and nest in houses. This mite can cause severe pruritus
Figure 165.13 Lynxacarus radovsky mite. Source: Courtesy of along with papules and crusts. Most cases present with
Dr Clarissa Pimentel de Souza. lesions on the limbs and dorsum.