A 5-year-old girl from Delhi is brought to the emergency department with a 3-day history of high fever, cough, and rapid breathing. On examination, she is irritable, with a respiratory rate of 52/min, intercostal retractions, and grunting. Blood pressure is 88/56 mmHg (low for age), heart rate 156/min, and capillary refill time is 2.5 seconds. Extremities are warm. Oxygen saturation is 88% on room air. Blood culture is pending. What is the most likely type of shock, and what is the immediate next step?