Strep pyogenes - Answers Beta hemolysis bacteria strain. Group A lancefield, responsible for 90% human
strep infections resulting in pharyngitis, scarlet fever, rheumatic fever.
Lancefield groupings - Answers Catalase-, coagulase-, strep groupings based on carbohydrate
composition of bacterial antigens located in the cell wall. Grouped A, B, C, et.
Strep pharyngitis - Answers 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 - Answers 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 - Answers 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.
Staphylococcus - Answers Gram+ round bacteria form grape-like clusters. Catalase+ and coagulase+,
facultative anaerobe. Grows in bile salts so can be deferentially screened. Found in about 30% of
humans. Commensal bacterium.
facultative anaerobes - Answers can live with or without oxygen
Commensal - Answers Bacteria that neither harms nor benefits its host.
Folliculitis - Answers Staphylococcus infection of hair follicule forming pustules or larger boils and
carbuncles.
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