What is the definition or description of: streptococcus?

Streptococcus. Is a group of bacteria that grown in long chains of cocci (round cells). They are classified in part by whether they hemolyze sheep red blood cells completely, partial or not at all. The beta (complete) hemolysis ones are further classified by their capsules and the prototype is group a streptococci, that cause strep throat and rheumatic fever. The Alpha (partial) strep cause heart infection.