An 18-year-old woman is brought to the emergency room with 1 day of severe headache. Her roommate, who called 911 when she noticed she appeared somnolent, reports that she was also having fever and vomiting, and complaining that the light bothered her. She is a freshman in college and lives on campus. On exam BP is 80/50, HR 125, RR24 and she is somnolent and confused. She has neck stiffness, photophobia and a petechial rash. A lumbar puncture is performed that reveals hypoglycorrhachia (low glucose), elevated protein, and 1200 white blood cells (normal<6) of which 90% are polymorphonuclear cells. What is the Gram stain of the cerebrospinal fluid most likely to reveal?