Surveillances for the adverse events: Medical Officers on duty at the Diarrhoea Ward of I.D. Hospital, under the supervision of a clinician scientist will look for the development of symptoms like seizure, lethargy or altered consciousness, or marked irritability (i.e., irritable to touch). The investigations for these patients will include the determination of blood glucose at bedside, serum electrolytes, and presence of fever. The decision to do a spinal tap will be left to the clinician in-charge of the patients in the hospital. CSF and blood culture will be done as and when indicated. Serum electrolyte measurements will be made available round the clock.