On Ancylostoma paraduodenale, a New Species from Felines, Closely Related to A. duodenale.

Abstract

In 1911 Looss wrote as follows : “ Up to the present time Agchylostoma duodenale is known to occur with certainty only in Man. It is true that the older works and text-books state that it has also been found in various species of animals (some species of apes, the tiger, the dog, the horse, etc.). In opposition to these statements, attempts made on various occasions to infect adult dogs, cats, rabbits, guineapigs, rats, mice, etc., with the parasite yielded entirely negative results. Only with quite young dogs and cats (not more than three or four months old) was the infection partly successful. The results of all these attempts at artificial infection thus support the view that the older statements as to the natural occurrence of Agchylostoma duodenale in animals are founded on a confusion of this species with others …”