Abstract
The usefulness of subcutaneous injection of three local anesthetic agents to stimulate tick detachment in an animal model was evaluated. American dog ticks ( Dermacentor variabilis) were placed on three New Zealand white rabbits and allowed to attach for 24 hours. Dead and unattached ticks were manually removed. Three local anesthetic agents were studied: 1% lidocaine (group A); 1% lidocaine with epinephrine 1:200,000 (group B); and 1% chloroprocaine (group C). For each group, a total of 0.25 mL of anesthetic agent was injected subcutaneously under the attached portion of each tick, resulting in formation of a 5- to 6-mm wheal. For all three anesthetic agents studied (group A, 34 ticks; group B, 28 ticks; group C, 31 ticks), none of the ticks spontaneously detached within 1 hour after injection. Subcutaneous injection of 1% lidocaine, 1% lidocaine with epinephrine, and 1% chloroprocaine are not effective methods for rapid tick removal in the animal model.
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