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Micro - Streptococci (i) (intro (optimal growth in blood agar (haemolysis…
Micro - Streptococci (i)
intro
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most are facultative anaerobes, but some are strict/obligate anaerobes
catalase (enzyme that reduces H2O2 to H2O + O2 - look for bubbles) -ve (distinguishes from staph which are catalase +ve)
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Dx of infection
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appropriate samples based on site (blood, urine, CSF, throat swab)
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Group C
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cause tonsillitis, wound sepsis, puerperal fever (uterine infection post-childbirth)
Group G
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cause upper RTIs, endocarditis
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Viridans Strep
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all lack antigens except S Bovis (group D, CR cancer + endocarditis)
part of normal flora (oropharynx, GIT, GUT)
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Peptostreptococcus
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colonise in oral cavity, GIT, GUT, skin
cause pelvic infection, intra-ab abscesses, sinusitis, brain abscesses, aspiration pneumonia