A six-month-old male child was brought to the opd with the chief complaint of fever, inability to feed and seizures since the morning. On examination, the child was found to have altered sensorium and neck rigidity. A lumbar puncture was carried out and CSF sent for examination. The cytology and biochemistry results were suggestive of pyogenic meningitis. Microscopic examination revealed the presence of Gram-negative coccobacilli. On culture on blood agar , the microbe shows the following phenomenon: