A 3-year-old boy from rural Maharashtra presents with a 2-day history of high fever (39.5°C), severe headache, neck stiffness, and photophobia. On examination, he is irritable with a positive Kernig sign. CSF analysis shows: WBC 450/µL (90% neutrophils), protein 120 mg/dL, glucose 25 mg/dL (serum glucose 90 mg/dL), Gram stain shows small pleomorphic gram-negative coccobacilli. Blood and CSF cultures are pending. What is the most likely causative organism?