Gram-negative bacteria show pink or red on staining ... which can then cause blood infections to develop. Streptococcus pneumoniae is the cause of community-acquired pneumonia (CAP).

This is in contrast to Streptococcus species, whose growth is selected against ... This is a test commonly used when trying to identify Gram-negative enteric bacteria, all of which are glucose ...

"Normal flora" include Streptococcus pneumoniae, Haemophilus influenzae, Staphylococcus aureus, and anaerobes such as Bacteroides species, anaerobic gram-positive cocci, and Fusobacterium species.