Microbiology TEST 1
Microbiology 4th Semester
Microbiology 4th Semester
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Cartes-fiches
Difference btw gylcocalyx and capsule?
A Biofilm is:
Pili - Fimbriae is
2 types of pili:
Name role in bacterial pathogenicity of long conjugate pili and short attachment pili
Flagella is:
which bacteria form endospores?
Endospores are
Germination of endospores
Autoclave used for surgical devices for destruction of spores in which bacteria?
And what is done by autoclave?
- surgical devices are heated by AUTOCLAVE using steam under pressure to 121degrees for 15min. to ensure destruction of spores
- in bacillus cereus & bacillus anthracis
- in clostridium difficile, tetani, botulinum, perfringes
What is axial filament?
Axial filament found in ?
Name Aerobic Cocci Gram-Positive Bacteria
Name Anaerobic Rod Gram-Positive
Name Aerobic Rod Gram-Positive
Name Anaerobic Cocci Gram-Positive
Name Anaerobic Rod Gram-Negative
Name Aerobic/ Facultative Anaerobic ROD Gram-Negative
Name Aerobic Cocci Gram-Negative
Definition of dissemination of disease
- disease that affects a number of organs and tissues or the whole body
- dissemination via blood
Exotoxins are
endogenous bacteria are
staphylococcus how many types most kown?
staphylococcus aureus, staphylococcus epidermidis and staphylococcus saprophyticus are all catalase-positive true or false?
staphylococcus aureus, staphylococcus epidermidis and staphylococcus saprophyticus are all coagulase- positive true or false?
Do streptococci have catalse enzyme ?
What does coagulase?
elaborates the enzyme coagulase, which activates prothrombin, causing blood to clot
All 3 Staphylococci can grow under
Staphylococci are endogenous (natural flora) or exogenous bacteria?
Are endogenous thus part of the natural flora found on skin and mucosal surfaces
Name Staphylococcus Aureus Virulence Factors of the Cell Wall:
HINT: name 5
1. Protein A- binds immunoglobulins thus prevents opsonization& phagocytosis
2. Glycocalyx and Slime Layer - bind bacteria to host tissue or prosthetic devices/foreign bodies
3. Surface adhesion protein - binding to host tissue (fibrinogen, fibronectin, collagen, elastin)
4. Peptidoglycan layer + Lipoteichoic acid
5. Coagulase has two Types (CF) - bound and free
Staphylococcus aureus Virulence Factors of the cell wall
Coagulase has two types in Staphylococcus Aureus - name and explain.
cell-free coagulase - reacts with coagulase-reacting factor forming staphylo-thrombin is a thrombin-like factor, that causes conversion of fibrinogen into fibrin
bound coagulase - is bound to staphylococcus cell wall causing direct conversion of fibrinogen into fibrin and cause staphylococcus to clump
What causes Staphylococcus Aureus Coagulase?
Staphyloccous is a endogenous bacteria causing what type of infection?
opportunistic infection - take advantage of preexisting conditions, such as immunosuppressed patients
Staphylococcus aureus reservoir ?
Staphylococcus aureus transmission
4 enzmyes present in Staphylococcus Aureus -name them.
1. Coagulase
2. Catalse
3. Hyaluronidase
4. Fibrinolysin or staphylokinase
Fibrinolysin is a enzyme in Staphylococcus Aureus its function is to:
In staphylococcus AUREUS enzymes = Hyaluronidase, Lipase, Protease, Staphylokinase/Fibrinolysin are:
In adult and older children Staphylococcus Aureus mainly ubiquitous in:
approximately 15% of normal healthy adults and higher incidence for hospitalized patients!
