5years old /Female H/O Sudden onset non projectile vomiting multiple episodes, with mild fever( not documented), along with Water-greenish stools since YESTERDAY (10/06/18) night. SHOCK on arrival in ER, Drowsy, arousable, bounding peripheral pulses, CRT >4sec. CBG - 63, BP- 70/40mmHg. Received 2 boluses of 20ml/kg in ER, Adrenalin started through peripheral line. Hypoglycemia corrected, First dose Abx given( Ceftriaxone /Doxy) Shifted to PICU CRP- 130, Lactate 4.4, WBC - 3300 (P 74, L25), plat- 3.8. Now Hemodynamicaly well on Adrenalin, Sensorium- slightly dull, awake, responding appropriately Febrile(101.1), HR 176/min, BP- 82/64 (73) What is the acute cause for this condition and dds, approach