Steven Ackerman, F. Brian Clare, T. W. McGill, Daniel E. Sonenshine, Passage of Host Serum Components, including Antibody, across the Digestive Tract of Dermacentor variabilis (Say), The Journal of Parasitology, Vol. 67, No. 5 (Oct., 1981), pp. 737-740
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Ackerman et al. (1981) studied this question.