Groups are determined by PRECIPITIN test, serologic test to measure a specific reaction between antigen (C carbohydrate, located in the cell wall) and antibody which results in a visible precipitate. Group A Streptococci (Streptococcus pyogenes) is among the most important human pathogens.
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Streptococcus pneumonia (pneumococcus) is the leading cause of vaccine-preventable illness and death in the US. Pneumococcal Infections can cause pneumonia, blood infections, meningitis and other respiratory infections.