1. Use of antimalarials (other than that prescribed by the investigator) or systemic antibiotics with known antimalarial activity within 30 days prior to the first vaccine dose (e.g. Trimethoprim-Sulfamethoxazole, Doxycycline, Tetracycline, Clindamycin, Erythromycin, Fluoroquinolones, or Azithromycin)