microbiology ch 11( streptococci, staphylococci, and micrococci Flashcards Preview

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Flashcards in microbiology ch 11( streptococci, staphylococci, and micrococci Deck (17)
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1

Name the 3 different ways streptococci causes haemolysis

alpha- partial haemolysis with green color
beta- wide clear zone of complete lysis
gamma- no lysis

2

Name the 4 groups of streptococci

A- streptococcus pyogenes, human disease
B- streptococcus agalactiae ( female genital tract)
C- animals
D- Enterococci, human disease

3

Strep. Pyogenes

Nasopharynx & skin, Beta haemolysis, causes tonsillitis, pharyngitis, peritonsillar abcess, scarlet fever etc...

4

what toxins does strep pyogense have?

streptokinase- lyses fibrin
Hyaluronidase- attacks material which binds connective tissue thus causing increased permeability ( spreading factor
DNAases- destroy DNA
Haemolysins- erythematous rash in scarlet fever.

5

Strep. agalactiae

human vagina and passed to kid during nursing, Causes neonatal meningitis and sepsis, beta haemolytic

6

Oral streptococci

in oropharynx, mostly alpha but beta and gamma are present,.

7

oral streptococci role in dentistry

Secrete sticky polysacharide which allows binding to enamel. Can cause infective endocarditis after dental procedure

8

Name the 4 groups of oral streptococci

mutans, salivarius, anginosus, mitis

9

Streptococcus pneumoniae

upper respiratory tract, causes pneumonia, & meningitis and otitis media in children, gram positive lancet- shaped cocci ( diplococcic), alpha haemolytic

10

staphylococci

high in adults ove 70., grapelike clusters, includes aureus and epidermidis and saprophyticus, causes absesses of organs, endocarditis, gastroenteritis and toxic shock syndrome

11

Staph aureus

skin, anterior nares, perineum, transmitted via hands, catalase positive, positive for protein A-latex agglutination test

12

how can you tell aures and epidermis apart?

aureus coagulates blood, epidermis doesnt

13

toxins of staph aureus

coagulase- clots plasma
enterotoxin- diarrhoea

14

some staph aureus have a beta lactamase plasmid. What does this do ?

provides resistants to penicillin

15

staphylococcus epidermis

skin, coagulase negative, resistant to penicillin and methicillin, sensative to vancomyocin

16

staphylococcus saprophyticus

UTI's in woman, infections with intercourse, Can be differentiated by using the mannitol fermentation reaction test.

17

micrococci

coagulase negative, stomatococcus mucilagenosus is found on tongue and makes slime