Enterococcus Introduction Enterococcus is a genus of Gram-positive bacteria. At first, scientists classified them as Group D Streptococcus, but later on, they recognized Enterococcus as a separate genus. In addition, these organisms naturally reside in
Streptococcus Introduction Gram-positive cocci in chains or pairs.Facultative anaerobes, non-motile, non-spore forming, catalase-negative.Normal flora of upper respiratory tract, skin, intestine, genital tract.Causes pyogenic, toxigenic, and immune-mediated diseases. Streptococci Species 1.β-hemolytic Streptococci Group A: S. pyogenes