1-15 Cocci Flashcards
S.agalactiae
Group B strep
beta hemolytic
resistant to bacitracin
CAMP test
has capsule
found in genital tract of women, can be passed to children
staph grow in and are catalase
clumps, positive
staph virulence factors
protein A - binds immunoglobulins
capsule
Toxins - coagulase, enterotoxin, exfolatin, TSST
staph tends to
form abcessed, stay in one area (infected elbow)
s.saprophyticus
gram +, coagulase -, non hemolytic, novobiocin resistant
describe strep
gram + cocci that grow in chains
what are strep classified by?
the hemolysis they cause on blood agar plates
virulence factors of strep?
pili
s.pneumocicci virulence factors and hemolysis? shape?
alpha hemoyltic, diplococci. optochin sensitive
capsule is antigen and virulence factor
s.mutans
virulence?
alpha hemo ,optochin resistant
virulence - sugar-metabolizing enzymes (decalcifies enamel and dentin)
why is a smoker more likely to get pneumonia?
the natural resistance to lung infections (mechanical clearance by mucus and cilia) is inhibited in smokers and others
s.pyogenes
virulence?
Group A strep. Beta hemolytic, catalase -, bacitracin sensitive
pilli encoded by pathogenicity island
toxins - streptokinase,
e.fecalis
non hemolytic (group D strep). bile resistant. Anerobic. Normal flora of colon
the two neisseria
N. miningitides - ferments maltose, capsule
N. gonorrhoeae - does not ferment maltose. pili allow attatchment, sexual transmission, inside neutrophils.
cocci appearance
Cocci are very small (1 micron in diameter – about 1/10 the size of an erythrocyte), spherical bacteria. They can be found in chains (streptococci), pairs (diplococci), or clumps (staphylococci).
