Tick populations, including those of A. americanum, may cause intense infestation pressure at times of the year when climatic and other environmental factors favor their survival. In some cases, the sheer number of ticks questing in a given area may overwhelm control measures.
In addition, some acaricides kill ticks after attachment. Close examination of the ticks on these dogs may well reveal that, although ticks are present, they are not alive or actively feeding and, thus, do not create an infection risk to the pets.
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