University:
Western Sydney University
Course:
MEDI 2003 | Clinical Sciences 2
Academic year:

2024
Views:

186

Pages:

1
Author:

Mariam A. A.

Streptococcus pyogenes to polymorphococcus Common Traits gram-positive cocci that occur in chains non-motile, non-spore-forming, facultative anaerobes sensitive to drying but resistant to disinfectants classified based on hemolysis, lancefield group, and serological tests S. Pyogenes Group A Streptococcus beta-hemolytic causes impetigo, erysipelas, necrotizing fasciitis skin or throat infections most common (children) systemic infections (scarlet fever, pneumonia, STIs) long-term complications (rheumatic fever, acute glomerulonephritis) Streptococcus Pneumonia alpha-hemolytic causes pneumonia, meningitis, bacteremia, otitis media, sinusitis pneumococcal polysaccharide capsule (90 different types) S. pneumoniae normal flora of nasopharynx (5-50%) young children, elderly, immunocompromised people, lung disease or viral infections access to middle ear via eustachian tube streptolysins (SO) hemolysins erythrogenic (pyrogenic) toxins cause inflammation Tx: penicillin (but resistance) vaccines available for risk people S. viridans non-hemolytic endocarditis, dental caries, abscesses