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Effect of Ivermectin on the Volume of Blood Ingested by Two Species of Ticks (Acari: Ixodidae) Feeding on Cattle

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Females of the lone star tick, Amblyomma americanum (L.), and the American dog tick, Dermacentor variabilis (Say), were fed on ivermectin (Ivomec)-treated and untreated bovines to determine the effect of the acaricide on volume of blood ingested and to compare the weight differences between the treatment and control groups at various time intervals after attachment. Adult females from each genus were collected from Bos tarus hosts and subjected to hematin assays on three collection dates to estimate the volume of blood ingested. Before feeding, lone star ticks contained an average of 2.0 l of blood and had an average weight of 5.2 mg. Unengorged American dog tick females had an average blood volume of 3.3 l and a mean weight of 5.8 mg. Ticks of both species reacted to ivermectin by expressing lower mean weights, and they consumed smaller quantities of blood. Lone star tick females were significantly affected in terms of amount of blood consumed and body weight changes when compared with control ticks. After feeding on treated cattle, lone star tick females contained smaller quantities of blood than pretreatment females, but there were no significant differences observed until day 12 between the control and the treated groups. American dog tick females on treated hosts had measurable quantities of blood that were significantly different among the experimental groups.

Document Type: Research Article

Publication date: May 1, 1991

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  • Journal of Medical Entomology is published bimonthly in January, March, May, July, September, and November. The journal publishes reports on all phases of medical entomology and medical acarology, including the systematics and biology of insects, acarines, and other arthropods of public health and veterinary significance.

    The journal is divided into the following sections: Morphology, Systematics, Evolution; Sampling, Distribution, Dispersal; Development, Life History; Population and Community Ecology; Behavior, Chemical Ecology; Population Biology/Genetics; Molecular Biology/Genomics; Neurobiology, Physiology, Biochemistry; Vector Control, Pest Management, Resistance, Repellents; Arthropod/Host Interaction, Immunity; Vector/Pathogen/Host Interaction, Transmission; Vector-Borne Diseases, Surveillance, Prevention; Direct Injury, Myiasis, Forensics; Modeling/GIS, Risk Assessment, Economic Impact. In addition to full-length research articles, the journal publishes interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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