While camping with some friends in Anywhere National Forest, I found a deer tick on a friend. After removing it with tweezers, is there anything else I should do? Should we abandon our trip immediately or is staying a few more days in the wilderness before seeing a doctor safe?
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You should keep the bite site clean (make sure you got the whole tick out, and didn't leave the head behind, still in the skin). This is to avoid infection. Then, watch the area to look for a rash.
The Lyme Disease rash generally (but not always) will have a bulls-eye pattern to it, with concentric circles of redness around the bite location. Some circles might not be full circles. Also, sometimes, there is no rash at all, but that is the general pattern to the rash.
I wouldn't cut the trip short just upon seeing the tick, but I would keep an eye on it. Not all ticks carry the disease, and if you removed the tick soon after it bit, it is less likely that you will be infected (assuming the tick has the disease).
Edited to add: for a clearer reference, here's the size of a typical nymph:
I contracted ehrlichiosis a couple years ago. I got a few dozen ticks during a hike and didn't notice for a few hours until I was home and in shorts after a shower. Here's what I learned:
Some important additional points about Lyme disease:
But those are both mainly for peace of mind; if it's a deer tick, always save it, clean the bite, and keep an eye on the area for a few weeks. But that's also true for any tick bites, generally.
Put on neosporin and keep an eye on it for a few days looking for an oddly shaped rash.
More info on Lime disease: http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0002296/
More info on Rocky Mountain Spotted Fever: http://oklahomapoison.org/general/tick.asp
More detailed tick first aid: http://www.mayoclinic.com/health/first-aid-tick-bites/FA00062
I would stay with the trip. I get ticks regularly, and it has never been serious.