- All subjects must give written informed consent to participate on study. In Kenya, a child is considered < 18 years of age and an adult ≥ 18 years of age. All children will have their parental or legal guardian provide consent.. Children between the ages of 7 and < 18 years old should be given the opportunity to provide their assent. For children between the ages of 7 and 11 years old this should be done using the parental consent form assent statement. For children > 11 years old assent should be documented using the IRB approved assent form.