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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Accidents were the third leading cause for men and the sixth for women. When analyzed by age, accidents were the top cause of death for children and adults under 44 years old. Cancer (30.5%) and heart disease (25.5%) were the leading causes for those 45 to 64 and 65 years and older, respectively.