Thin and thick blood smears were also collected from participants who accepted malaria testing. Blood slides were stained with Giemsa stain that was prepared by the laboratory in advance of the field work. Parasite densities were calculated by counting the number of asexual stage parasites/200 white blood cells (WBCs), assuming 6000 WBCs/dl of blood. Blood smears were considered negative if no parasites were found after counting 200 fields. An informed consent form was read to the eligible person or parent/responsible adult of the child or teenager ages 15-18 years old. This consent form asks, first of all, for the authorization of.
