How do they stop the spread of disease? What happens in a crowded school to prevent the spread of disease? Do they have certain procedures that they follow?

These are pictures of student dorm rooms in a school, notice some students may have mosquito netting.

They really don’t have any special procedures that they follow. If a student is sick, they just soldier on.  Depending on how sick a student may be dismissed from class for a day. None of the schools we visited have a nurse. If a student gets really sick like with Typhoid or Malaria, they send them home to recover and then they can return to school. Most schools do not have running water so the water is either brought from a well or collected in rain barrels, that is the water they drink and use for washing. Keeping the hair short keeps lice away. The bathrooms are mostly pit toliets ( I will try to get a photo for you) a pit toliet is really just a hole in the ground. Showers are often outside in an open shower room and the water is cold... no power for heating water here!