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Genus Streptococcus (Beta-Hemolytic
Completely hemolyze red blood…
Genus Streptococcus
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Treatment & Prevention
Beta-Hemolytic
-Groups A & B are treated w/ penicillin
-Sensitivity testing used for enterococci
-No vaccines available
Alpha-Hemolytic-Traditionally treated w/ penicillin G/V-Combination drug therapy required due to increased drug resistance-2 available vaccines for high risk individuals
- Capsular antigen vaccine for older adults & other high-risk individuals (effective for 5 yrs.)
- Conjugate vaccine for children 2-23 mos.
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General Characteristics
-Gram-Positive spherical/ovoid cocci arranged in long chains; commonly in pairs
-Non-spore-forming & non-motile
-Can form capsules & slime layers
-Anaerobic
-Catalase-Negative, but have a peroxidase system
-Most parasitic forms require an enriched media to grow; do not survive well outside the host
-Small, non-pigmented colonies
-Sensitive to drying, heat & disinfectants
-25 species
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