streptococcus

Paediatrics

Acute Rheumatic Fever in Children

Definition: Immunologic sequel of a previous group A beta hemolytic streptococcal infection of pharynx (not of the skin according to some researches). The rheumatogenic strains are M 1, 3, 5, 6, 14, 18, 19 and 24. Pathogenesis: Molecular mimicry Affects brain, heart, joints, and skin In genetically vulnerable host Pathogenesis and morphology: Rheumatic fever and […]

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Pathology

Rheumatic Fever and Rheumatic Heart Disease

Definition: Rheumatic fever (RF) is an acute, immunologically mediated, multisystem inflammatory disease involving heart, joints, CNS, skin and other tissues that occurs a few weeks after an episode of group A β-hemolytic streptococcal pharyngitis. Acute rheumatic heart disease (RHD) is the cardiac manifestation of RF and is associated with inflammation of the valves, myocardium, or pericardium. […]

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MBBS Exams Microbiology

Staphylococcus Aureus : Lab Diagnosis and Diseases

STAPHYLOCOCCUS: Classification: Family: Micrococcacea Genus: Micrococcus and Staphylococcus Species: S.aureus, S.epidermidis, S.saprophyticus, M.luteus, etc. Streptoccaceae and Micrococcacea both are family of gram positive cocci. 1. Streptococcacea : Catalase negative 2. Micrococcacea : Catalase positive Based on coagulase production, micrococcacea are: a. Coagulase positive: S.aureus b. Coagulase negative: S.epidermidis, S.saprophyticus Micrococcus is strictly anaerobic, form irregular […]

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