is group a strep gram positive
Streptococci are a large group of gram-positive, nonmotile, nonâspore-forming cocci about 0.5-1.2Âµm in size. They often grow in pairs or chains and are negative for oxidase and catalase. S pyogenes tends to colonize the upper respiratory tract and is highly virulent as it overcomes the host defense system.
Streptococci are gram-positive aerobic organisms that cause many disorders, including pharyngitis, pneumonia, wound and skin infections, sepsis, and endocarditis. Symptoms vary with the organ infected. Sequelae include rheumatic fever and glomerulonephritis.