Volume 6, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


Summary and Conclusions

A high incidence of infection with was found in dogs aged 3–6 months. In mature dogs a marked difference in resistance is found between the sexes. Males exhibit little resistance to as compared to females, whose resistance increases up to the age of 3 years. A pronounced variation in seasonal incidence of was found in male dogs; the incidence was highest during winter and lowest during summer months. Female dogs showed a fairly uniform seasonal incidence. Evidence is provided in this study to show that in the Midwestern area of the United States is a common parasite of dogs.


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