Diarrhoea will be defined as an episode of the passage of three or more loose or watery stools within 24 hours. Presence of blood with stool will be defined as invasive diarrhea. When a single episode of diarrhea lasts for more than two weeks, it will be called persistent diarrhoea. Acute respiratory illnesses will be define as an episode of cough with reported fast and rapid breathing or difficulty breathing with or without fever.