He can send the tick to IGeneX for Lyme testing. See http://www.igenex.com/ for info.
Testing at this early stage is going to be negative unless they biopsy or culture the bite site (and even then, may still be negative) - it is too early for there to be enough detectable antibodies.
Doxycycline is considered the best abx; probably should take it for at least 4 weeks to be safe. The dose needs to be high enough, too...most rx 200mg/day but I think it is supposed to be 400-600mg/day to be more effective...
Chronic Lyme Disease, Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication/Chemical Allergies & Intolerances, Asthma, Gut issues (dysmotility, non-specific inflammation), UCTD ("Secondary Lupus-Like Syndrome"), Osteoporosis, Pancytopenia, chronic malabsorption/malnutrition, etc.; G-Tube; Currently TPN-dependent.
Meds: Zofran, Pulmicort, Heparin (to flush PICC line), Claritin, Colloidal Silver (used topically), IV Milk Thistle, probiotics.