Final answer:
The direct answer is B. Streptococcus pyogenes, which is the bacteria classified as Group A Streptococcus (GAS). It is known for causing various infections including strep throat and impetigo, and it's identifiable through its ß-hemolytic activity when grown on Blood Agar Plates.
Step-by-step explanation:
The bacteria classified as Group A strep is B. Streptococcus pyogenes.Group A streptococcus, also known as Streptococcus pyogenes, is a bacterium that is categorized and identified through the use of serological typing into Lancefield groups. This classification is based on the unique characteristics of their surface carbohydrates and their hemolytic properties when cultured on Blood Agar Plates.
Specifically, S. pyogenes is known for its ß-hemolytic activity and its role in causing various human diseases. Rebecca Lancefield's work in the 1930s led to the serological classification of streptococci, where S. pyogenes was grouped in Lancefield Group A due to the presence of specific cell surface antigens.S. pyogenes is associated with several disease conditions, including strep throat, impetigo, necrotizing fasciitis, and it is noted for its pus production in infections. It is the sole member of Lancefield group A and possesses virulence factors like the M protein and a capsule that aid in evading the immune system while causing a pronounced inflammatory response.