Hip
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Does the presence of 100 attached deer ticks qualify as an infestation?
It's not really a constant population of ticks living on your skin as you get with animals. It only occurred when you went camping. And were those ticks on your trousers and socks, or were they actually on your skin, biting you?
Another point to mention is that because Borrelia is scarce in the body and blood in those who carry it (hence the difficulty in detecting Borrelia infection using blood tests), when a tick from say a camping trip bites a human with Borrelia, what are the chances the tick is infected with Borrelia, given its scarcity in human blood? Yes, when a tick lives on a Borrelia-infected animal, and is constantly biting the animal and feeding from the blood, there would be a higher chance the tick picks up a Borrelia infection from the animal.
But in the case of a single bite of a human who carries Borrelia, how likely is it that the tick picks up the infection from the human? And how likely is it that the same tick survives (because we normally kill the ticks that we find biting us), and then leaves that human and goes off and bites another human? The whole scenario continues to look highly improbable.
This is done by state reporting agencies throughout counties in Lyme endemic areas in the US by professional entomologists, i.e. they are gauging the prevalence of Lyme in ticks, not humans.
Sorry, I misread your earlier post, and thought you were referring to humans, not the ticks.