Abstract
Toxascaris leonina was detected from 8 Japanese-breed domestic cats in Kanagawa Prefecturefrom October, 1983 to March, 1985. Feline infections had hardly been reported in Japan. Cat 1 had been kept indoor out of contact with imported or purebred cats. The ascarids of the cat seemed to be of the “dog strain”, because of their high and low infectivity to dogs and cats, respectively. Cats 2-7 were kept together on the same farm and got incontact with imported cats. With ascarid eggs from one of those cats, dogs and cats wereeasily infected, so that the ascarids seemed to be of the “cat strain” which wouldhave been introduced by imported cats and maintained on the farm. The history of Cat 8 wasnot determined, but its ascarids might be of the “cat strain” because oftheir high infectivity to both dogs and cats.
Milbemycin D was administered orally to 3and2 naturally infected cats in doses of 0.05 and 0.1 mg/kg, respectively to deworm all the animals completely, except one administered with 0.05 mg/kg from which young adult worms were recovered at autopsy.
