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3 ways pathogens cause disease:
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- direct (invasion & multiplication)
- produce toxins
- immunopathological damage (immune system is causing the damage)
- produce toxins
- immunopathological damage (immune system is causing the damage)
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anything that increases the virulence
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virulence factor
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what are some virulence factors? (anything that increases the virulence)
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- capsules
- pili
- extracellular enzymes
- pili
- extracellular enzymes
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this way that pathogens cause disease is when pathogens use virulence factors to invade the body.
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direct (invasion and multiplication)
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what are the three main virulence factors pathogens produce, when attacking directly?
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-hyaluronidase
-collagenase
-coagulace
-collagenase
-coagulace
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this is an enzyme that bacteria can produce. it breaks down hyaluronic acid and ground substance. by breaking this down, bacteria can spread.
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hyaluronidase
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this is an enzyme that bacteria can produce that clots plasma
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coagulace
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Bacteria produce this enzyme. It's an enzyme that breaks down collagen
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collagenase
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what is the #1 protein in the body?
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collagen
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what is the main bacteria that produces coagulace?
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S.aureus
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S.aureus protects itself by producing coagulace which forms a clot. inside the clot, they multiply. now they are trapped. to spread throughout the body they have to break out of the clot. to do this they produce another enzyme called..
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fibrolysin
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what does fibrolysin do?
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breaks down the clot so bacteria can spread
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main bacteria that produce fibrolysin:
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Group A Strep
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first enzymes used in human medicine; breaks up clot
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streptokinase
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Group A Strep produce a fibrolysin called __________.
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streptokinase
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two types of toxins:
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- endotoxins
- exotoxins
- exotoxins
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Exotoxins are gram ________.
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gram (+) AND (-)
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Most exotoxins are _______.
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proteins
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are exotoxins or endotoxins heat labile (sensitive)?
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exotoxins are heat sensitive
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____-toxins are excreted live.
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exo
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Endotoxins are gram _______.
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negative ONLY
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How are endotoxins released?
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through lysis (they kill the cell)
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What are most endotoxins?
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LPS lipopolysaccharide
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Lipid ___ is the toxic portion of LPS.
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A
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Are exotoxins or endotoxins heat stable?
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endotoxins
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Can you destroy endotoxins by autoclaving?
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no
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Gram ______ bacteria can grow in distilled water.
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negative
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An IV must be sterile and ______-free (can't have anything in it that causes fever).
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pyrogen
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__________ is the strongest fever producer known.
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LPS
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horse-shoe crab
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Limmulus
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Limmulus has _____ blood.
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blue
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The blood cells of a limmulus are called __________.
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ameobocytes
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Scientists found that limmulus blood would harden, due to gram ________ bacteria.
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negative
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Limmulus amoebocyte lysate has become the main test for ___________.
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IV fluids
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this is the main test for testing IV fluids for gram negative bacteria.
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limmulus amoebocyte lysate
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Toxoid vaccines are found in _____.
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DtaP
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tetanus and diphtheria vaccines are __________ vaccines.
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toxoid
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the vaccines against tetanus and diphtheria are _________, which are in inactivated toxins.
answer
toxoids