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Diarrhea remains the leading cause of morbidity and mortality in children under 5 years old worldwide. The burden is disproportionately high among children in low- and middle-income countries. Many studies have established that the diarrhea prevalence is higher in younger children, 6-11 months, and boys than girls. Some studies have revealed that children not washing hand before meals or after defecation, mothers not washing hands before feeding children or preparing food, children eating with their hands rather than with spoons, eating of cold leftovers, dirty feeding bottles and utensils, unhygienic domestic places were associated with risk of diarrhea morbidity in children. In general, the morbidity of diarrhea is lowest in exclusively breast-fed children; it is higher in partially breast-fed children, and highest in fully-weaned children. The preventive practices according to WHO include; breast feeding, improved weaning, use of plenty of water for hygiene and clean water for drinking, hand washing, use of latrines, proper disposal of the stools of young children and immunization against measles, exclusive breast feeding during the first 4- 6 months greatly reduces the risk of severe or fatal diarrhea and the risk of other serious infections are also reduced.

Human Immunodeficiency Virus (HIV) infection is a major public health threat to the existence of human beings especially to the developing countries like in Africa. Human Immunodeficiency Virus attacks the CD4 T cells thereby suppressing the immunity of the human host. There is high level of malnutrition in the developing countries due to poor economic status of many individuals with attendant immunodeficiency which affects the patients with HIV drastically for survival. Patients with HIV infection should maintain good nutritional status with improved immunity for increased life span and effectiveness in their works. A lot of commitment from the society is needed to encourage the patients with HIV to reduce the morbidity and mortality rates associated to HIV infection.