Two Decembers ago I developed low-grade fever and lethargy for no apparent reason. When a rash (not a bull's eye, just a nebulous rash) appeared on my belly, I arranged a visit to the doctor who, after conferring with another doctor, decided to put me on a 21-day doxycycline regimen. Hours after returning home, the rash had quadrupled in size; but after only two days of treatment, my health was restored. (I did take the antibiotic for the prescribed 21 days.)
Two weeks later (January, now), I found another embedded tick. So, back to the doctor, but this time only a few doxycycline capsules were necessary (possible if treatment begins within 72 hours of the bite).
Since then, both my wife and I have had several (summertime) encounters with lodged ticks. I now religiously spray myself with DEET before going out to scythe, and baths followed by thorough tick checks are the rule for the grandchildren.