Is there a word or term for the state of a human or animal infested with ticks?
Mainly just curious.
He's suffering from ______.
Don't get near him: he has _____.
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Ectoparasitism TFD is the medical term:
the state in which the ectoparasite [ticks, lice] are living on the surface of the host's body.
He went to the doctor with ticks, and was diagnosed with ectoparasitosis.
For the second sentence example you can simply use "ticks" - "don't go near him he has ticks", just as you would with lice or fleas.
If sticking to a single word is not essential you might want to be more specific and say "an infestation of ticks" - to make it clear that the subject has a large number of the parasites, not just one or two.
"an infestation of ticks" could also work in the first sentence example. "He's suffering from an infestation of ticks"
: affected or infested with or full of ticks
If you are looking for an informal way of saying it, you pretty much have the most natural way already:
"he is tick-infested" or "he is infested with ticks".
Saying "He has ..." is asking for a formal medical condition, like diabetes. The most informal of this would be
"He has a problem with ticks" or "He has a lot of ticks".