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.
The majority of car accidents are caused by irresponsible driving behavior. Statistics also show that 98 % of car accidents involve a single distracted driver. Some common causes include: 1  Rubbernecking: Drivers slowing down their cars to watch what is going on. 2  Cell phones: Drivers using their commute time to make phone calls. 3  Driver fatigue. 4  Passenger distractions. 5  Looking at scenery.