Consider these suspected causes of the patient's meningitis: Neisseria meningitidis, Streptococcus pneumoniae, Haemophilus influenzae, and Escherichia coli. The CSF sample was Gram-stained and simultaneously plated onto three different types of growth media: chocolate agar, blood agar, and Hektoen agar. The following results were obtained: rods that were Gram-negative and positive for growth on all three types of growth media. Which organism(s) could be causing the meningitis?

Choose one or more:

A.Streptococcus pneumoniae

B.Haemophilus influenzae

C.Escherichia coli

D.Neisseria meningitidis

Consider the selective growth medium that was used, especially the blood agar and the Hektoen agar, and use an algorithmic approach to narrow down the identity of the suspected pathogen