Effects of Crowding and of Superinfection on Habitat Selection and Egg Production in Ancylostoma caninum

parasite relationships of the hookworms. Several workers have tried to relate egg counts to the number of worms present. Stoll and Tseng (1925) found that egg counts gave a clue to the severity of hookworm disease in China. They indicated that egg counts, in terms of numbers per gram of feces, were the most satisfactory expression of relative worm burden. Sarles (1929) and McCoy (1931), working with Ancylostoma caninum in experimentally infected dogs, found an inverse relationship between egg production and the number and age of worms, but failed to find a correlation between worm burden and size of worms.