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The most. significant pathogens are Streptococcus pyogenes (Lancefield Group A), Streptococcus. agalactiae (Lancefield Group B) a nd Streptococcus pneumoniae. Some streptococci (fo rmerly. group D) n ow placed in the genus Enterococcus are of medical significance because they are.
The picture above is a wonderful example of the Streptococcus pyogenes being gram-positive. A bacteria is gram-positive when it is a purple color after being stained. As you can see, the Streptococcus pyogenes is a gram-positive bacteria.It can also be seen that the bacteria has a coccoid shape and grows in chains.This picture is a perfect example of what Streptococcus pyogenes looks like when it is properly gram stained. bacteria is gram-positive when it is a purple color after being stained. As you can see, the Streptococcus pyogenes is a gram-positive bacteria. It can also be seen that the bacteria has a coccoid shape and grows in chains.