Strep pyogenes - answer✔Beta hemolysis bacteria strain. Group A lancefield, responsible for
90% human strep infections resulting in pharyngitis, scarlet fever, rheumatic fever.
Lancefield groupings - answer✔Catalase-, coagulase-, strep groupings based on carbohydrate
composition of bacterial antigens located in the cell wall. Grouped A, B, C, et.
Strep pharyngitis - answer✔Group A disease with fever, enlargement of lymph nodes in neck
and reddening within throat lining causing sore throat. Can lead to ear, lung, sinus
complications and progress to rheumatic fever.
Rheumatic fever - answer✔Inflammation of joints, jerking, pea-sized nodules, rashes, heart
valve damage from similarity of heart tissue antigens. Occurs in 3% untreated strep pharyngitis
cases. Treated with penicillin.
Strep septicemia - answer✔Caused by Group B strep infection of blood and can infect other
surrounding tissues. Damage caused by fever as well, can precede or accompany meningitis or
endocarditis. Fever, chills, rapid breathing and heart rate, progresses to shock (with fever, or
hypothermia) and decrease in blood pressure. Treatment with antibiotics, IV fluids and oxygen.
Can also be caused by E. coli, Pseudomonas and Klebsiella.
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