Subjects will be randomized 1:1 to either receive a prescription drug voucher for oral antimicrobial therapy in the form of one double strength 160 milligrams (mg) trimethoprim/800mg sulfamethoxazole (double strength co-trimoxazole) twice daily plus folic acid 5 mg daily OR doxycycline 100mg once daily if weight < 50 kilograms (kg) or 100mg twice daily if weight > 50 kg. Patients randomized to receive antimicrobial therapy will be given co-trimoxazole unless they have an allergy, contraindication to co-trimoxazole, renal insufficiency (glomerular filtration rate (GFR) < 30 milliliters (ml)), are hyperkalemic (potassium > 5 milliequivalents(mEq)/liter(L)), or are concomitantly taking an angiotensin converting enzyme inhibitor (ACEI), angiotensin receptor blocker (ARB), or potassium sparing diuretic in which case they will receive doxycycline.