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.
Answers.comÂ® is making the world better one answer at a time. Striking an object is the leading cause of pwc accidents on boats.
The cause of an accident is when a situation or conflict arises  purely due to randomness and when conditions are more likely to  support the accident. If there is harm, damâ¦age, or injury  sustained, it is more than often completely due to chance.