Published online by Cambridge University Press: 31 May 2012
Ticks of various species are among the most important of the pests of animals, not only because of their direct effects as parasites, but also as a result of maladies they carry. Moreover, they are predisposing agents for attacks by important secondary invaders, such as foot-rot and screw-worm flies.
* Contribution from the Division of Infections Diseases, National Institute of Health, Rocky Mountain Laboratory, Hamilton, Montana. Presented at the meetings of the American Association for Advancement of Science in Ottawa, Ontario, Canada, June 27, 1938.