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Chrysomya bezziana (Diptera: Calliphoridae) infestation in two Malaysian cats treated with oral lotilaner

Han HS, Yasmin L

Vet Dermatol, 2020 Aug;31(4):335-e87.
PMID: 32323413 DOI: 10.1111/vde.12855

The most common fly species associated with screwworm myiasis in Southeast Asia is Chrysomya bezziana (Ch. bezziana), the Old-World screwworm. Treatment of screwworm myiasis in cats traditionally has comprised subcutaneous injection of ivermectin or oral administration of nitenpyram, combined with aggressive tissue debridement and larval removal under general anaesthesia. Two cats diagnosed with cutaneous myiasis caused by the larvae of Ch. bezziana were treated with lotilaner. In both cats, a single dose of lotilaner at 6-26 mg/kg, killed all larvae within 24 h, negating the need for general anaesthesia. Both cats were simultaneously infested with Lynxacarus radovskyi (L. radovskyi) which also was eradicated with lotilaner. No adverse reactions were observed and both cats recovered without complications.

Matched MeSH terms: Screw Worm Infection/veterinary*
Cattle herd inspections and fly trapping for the detection of the Old World screw-worm fly (Chrysomya bezziana)

Urech R, Muharsini S, Tozer RS, Sumartono, Green PE, Brown GW, et al.

Aust. Vet. J., 2014 Jan;92(1-2):28-32.
PMID: 24471879 DOI: 10.1111/avj.12142

To compare the sensitivity of inspections of cattle herds and adult fly trapping for detection of the Old World screw-worm fly (OWS).

Matched MeSH terms: Screw Worm Infection/veterinary*
Canine and feline cutaneous screw-worm myiasis in Malaysia: clinical aspects in 76 cases

Han HS, Toh PY, Yoong HB, Loh HM, Tan LL, Ng YY

Vet Dermatol, 2018 Oct;29(5):442-e148.
PMID: 30066413 DOI: 10.1111/vde.12672

BACKGROUND: Cutaneous screw-worm myiasis in companion animals either due to the New World screw-worm, Cochliomyia hominivorax or the Old World screw-worm, Chrysomya bezziana, has been reported particularly in tropical and subtropical regions of the world. Although treatment of screw-worm myiasis in dogs has been described, few studies have been conducted regarding its clinical and epidemiological aspects in companion animals.
OBJECTIVES: To describe clinical and epidemiological aspects of canine and feline screw-worm myiasis.
ANIMALS: Naturally infested dogs and cats, presented to five veterinary clinics in four Malaysian states from September 2017 to February 2018.
METHODS AND MATERIALS: Cutaneous screw-worm myiasis was diagnosed based on clinical signs and visual examination of burrowing larvae within lesion. Age, breed, gender, anatomical site of infestation and suspected underlying predisposing causes were investigated.
RESULTS: A total of 55 dogs and 21 cats were included in the study. Intact male mixed breed dogs (mean age 58 months) and intact male domestic short hair cats (mean age 24 months) with suspected fight-related wounds were most commonly presented with exudative and ulcerative lesions associated with screw-worm myiasis. The most common anatomical sites of infestation in the dogs were the external ear canals, followed by the perineum and medial canthus. For the cats, the most commonly affected areas were paws and tail. Five cats with screw-worm myiasis were concurrently infected with sporotrichosis.
CONCLUSION AND CLINICAL RELEVANCE: Aggression between unneutered animals is a likely underlying cause for cutaneous screw-worm myiasis in both cats and dogs. Sporotrichosis was also a potential predisposing cause for screw-worm myiasis in cats.

Matched MeSH terms: Screw Worm Infection/veterinary*
Use of insecticides to control screw-worm fly strike by Chrysomya bezziana in cattle

Perkins ID

Aust. Vet. J., 1987 Jan;64(1):17-20.
PMID: 2439062

Some insecticides to control and prevent screw-worm fly strike by Chrysomya bezziana in calves and adult cattle were tested in field trials on cattle in Sabah, East Malaysia. Ivermectin injected subcutaneously in newborn calves at 200 mu/kg provided 10 days protection from screw-worm fly strike, which allowed navels to dry. Ivermectin, 1% dichlofenthion plus gentian violet and 3% lindane plus pine oil smear were all effective in preventing re-strike of treated wounds in adult cattle. A single subcutaneous injection of ivermectin at 200 mu/kg was effective, whereas it was necessary to re-apply the dichlofenthion and lindane smear preparations every 48h.

Matched MeSH terms: Screw Worm Infection/veterinary*