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.
What is the leading cause of accident? Environmental, material, human number one cause of all auto accidents in the US - distracted drivers. get off the cell phone, stop texting, put the makeup away and set the sâ¦oda down and quit tuning the radio and reading the newspaper and and and pay attention to the road.
By far the biggest cause of road accidents is driver/rider error or reaction, which causes 68% of all crashes. The top ten most common causes of traffic accidents are: 1  Failed to look properly 35%. 2  Failed to judge other persons's path or speed 18.9%.  Careless, reckless or in a hurry 16.2%.