do cocci cause disease
Cocci bacteria are spherical in shape and include Gram-positive bacteria Staphylococcus aureus, Streptococcus pyogenes and Streptococcus pneumoniae, according to Todar's Online Textbook of Bacteriology. Gram-negative cocci bacteria include Neisseria gonorrhoeae and N. meningitidis. Staphylococcus aureus is most commonly found in the nasal membranes, skin and GI tract of humans, according to Todar's Online Textbook of Bacteriology. It is the most likely to cause disease and is considered a pathogen.