A pus culture on chocolate agar shows gram-negative cocci most likely organism is: (A) Hemophilus ducreyi, (B) Nisseria gonorrhoeae, (C) Streptococcus pyogenes, (D) Streptococcus pneumoniae
Answer is B. Streptococcus pneumoniae and Streptococcus pyogenes are gram-positive cocci. Hemophilus ducreyi is ovoid bacilli. It is gram negative but may appear gram-positive and frequently show bipolar staining. Gonococci is a gram-negative coccus. Reference: Textbook of Microbiology; Anathanarayan and panicker's; 10th edition; Page no: 236