Informed consent will be obtained from the parents or guardians. It will be explained that the study will examine whether antibiotics can prevent later complications, it is not known whether this is indeed the case. Therefore there will be one group receiving active treatment, and another group receiving placebo, and we do not know to which group the measles case belongs. It will also be explained if they do not want to participate, the management of the measles case will be as otherwise done in the study area.