Because the disease is a propagation of virus. Of children activities in groups. Society in Cambodia crowded and health care and inappropriate, such as don't wash your hands, use of equipment together, etc., which is a public health. Problem.
.The outbreak each time. To make the students be
stop learning. Parents may need to stop to take care of the children. The cost of medical treatment. Or sometimes have to be off!The school clean. These are all affect the economic, social or political all
.
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