Experimental Tick Paralysis in Laboratory Animals and Native Montana Rodents

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Abstract
Tick paralysis was produced by female Dermacentor andersoni ticks engorging on hamsters, guinea pigs, woodchucks, wood rats, dogs, and a rhesus monkey. Hamsters are the laboratory animal of choice since 73 of 169 became paralyzed in various tests, including adult progeny of ticks that had produced disease in previous generation. "Incubation" during initial feeding was 4 to 6 days, reduced to often less than 24 hours on transfer of partially fed ticks. Injection of salivary gland suspensions from "paralysis ticks" did not cause disease. No organism could be cultivated from tissues of affected animals. Laboratory-reared stocks of D. andersoni, D. variabilis, Rhipicephalus sanguineus, as well as D. occidentalis from Oregon, produced on paralysis.

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