Abstract
STUDIES of reactivity to tick bites and tick salivary gland homogenate have revealed responses similar to those induced by histamine in the skin of lop-eared rabbits2. Salivary gland homogenates of the tick Rhipicephalus sanguineus sanguineus, however, did not cause contraction of guinea pig ileum, but blocked the action of histamine acid phosphate (HAP). We have therefore tested this extract against other drugs known to cause contraction of guinea pig ileum in order to discover the spectrum of its blocking effect on this tissue. We have found that the salivary gland homogenate of this tick antagonises and potentiates, respectively, the action of histamine and acetylcholine on guinea pig ileum.
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