Sand flies will be collected on two consecutive nights with CDC light traps by trained personnel with guidance from a member of the study team. Light traps will be kept in a corner from 6 pm to 6 am, 2 inch away from the wall with a distance of 6 inches between the floor and the bottom of the sac. The sand fly density will be expressed as number of P. argentipes per light trap per night. Sand fly identification will be done as follows: