Tropical rat mite dermatitis. Report of six cases and review of mite infestations.

Six cases of tropical rat mite (Ornithonyssus bacoti) dermatitis are presented. The patients experienced papular urticaria, and mites were found on and identified in several of the patients. The presence of rodents in or around the home was confirmed in most cases.

Endemicity of Dirofilaria immitis and Dipetalonema reconditum in dogs of Pleasants Valley, Northern California.

A house-to-house survey of dogs in a 26-km2 area of Pleasants Valley (Northern California) was done to determine the prevalence of the filariids Dirofilaria immitis Leidy and Dipetalonema reconditum Grassi in the canine population. Blood samples were taken from the cephalic vein of 97 dogs (greater than or equal to 5 months of age) and were tested for the presence of microfilariae, using a modification of the Knott technique. Two dogs with autochthonous D immitis (2.

Trixacarus caviae infestation in two guinea pigs.

Sarcoptid mites identified as Trixacarus caviae (Acarina: Sarcoptidae) were found in skin scrapings taken from two pet guinea pigs with generalized skin lesions. Clinical signs included intense pruritus, widespread alopecia and hyperkeratosis. The lesions regressed following treatment with lime sulfur.

Studies on filariasis. IV. The rate of escape of the third-stage larvae of Brugia pahangi from the mouthpart of Aedes togoi during the blood meal.

The rate of escape of the third-stage larvae of Brugia pahangi from Aedes togoi which were allowed to probe on a cat and a mouse at time intervals of 5, 10, 20, 30 and 60 seconds was studied. The rate of escape of third-stage larvae at all time intervals was greater during probing on the cat than on the mouse, and was in a logarithmic linear relation to the length of probing time by the mosquito host. The greatest loss (91.