呆想－天空

beta-haemolysis-base on carbonate-C of cell wall

group A
streptococcus pygenes
streptococcus milleri(alpha)
streptcoccus salivarius(alpha)
-bacitracin sensitive
-strept throat, scarlet fever, wound infections, acute endocarditis


group B
stretococcus aglactiae
-CAMP positive,orange colony on Islam agar incubated anaerobically
-normal flora of female gential tract
-bovine mastitis, human neonatal sepsis and meningitis


group C
-3strains
-infections in animals
-sometimes on human


group D
-can be alpha,beta and gamma(non)
-more heat resist, may grow at 45oC
-positive in bile/esculin hydrolysis
-enterococcus:2strains-E. faecalis, E. faeceum
 i.tolarate 6.5% NaCl,penicillin, with endocarditis, UTI
-stretoccus bovis also a viridans streptococcus 


Viridans Streptococci
alpha haemolytic, not inhibited by optochin, normal flora of mouth
1.S. bovis
2.S. mitior (mitis)
3.S. mutans
4.S. milleri (intermedius)
5.S. salivarius
6.S. sanguis

not 4 ->dextran and cause dental caries and subacute endocarditis
4 in group A,C,F,G or cannot be grouped, can cause abscess and septicaemia


streptococcus pneumoniae-important pathogen