Exam 3 Lec 14 Flashcards

1
Q

define what a virulence factor is

A
they are cellular structures that:
-help bacteria colonize humans
-"             " evade immune response
-"             " inhibit immune response
-"             " enter in/out of cells
="            " obtain nutrients from host
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2
Q

what are some specific examples from class that virulence factors allow?

A
  • bacterial attachment to mammalian cells
  • polysaccharide capsules that surround pneumococcus and Pseudomonas and prevent phagocytosis
  • allow toxins to be produced or released from gram-positive/negative bacteria
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3
Q

what are the three types of toxins called that are produced by bacteria?

A

exotoxins
endotoxins
enterotoxins

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4
Q

what type of bacteria secrete exotoxins and what do exotoxins do?

A

gram-positive bacteria

-destroys mammalian cells or disrupt cellular function

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5
Q

what type of bacteria have endotoxins? what is it? what does it do? when would it be secreted?

A
  • gram-negative
  • a lipopolysaccharide component of the bacterial cell wall
  • contributes to septic or endotoxic shock
  • secreted upon death of bacteria
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6
Q

what secretes enterotoxins?

what bacteria produces a potent enterotoxin and what is the result?

A
  • molecules that cause food poisoning and diarrhea

- E coli causes severe diarrhea, dehydration, and death

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7
Q

what are two examples of exotoxins which we have developed vaccines to protect against?

A

diphtheria toxin and tetanus toxin

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8
Q

staphylococcal, cholera, and clostridia are all examples of bacteria that produce which type of toxin?

A

enterotoxins

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9
Q

what do adjuvants do when implemented into vaccines?

A

they stimulate systemic immunity and cause a slow release of antigen to continuously stimulate the immune system for a long period of time

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10
Q

what do mucosal adjuvants do?

A

they complex with the antigen and deliver it to M cells which transport the antigen into the lymphatic area

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11
Q

what are aluminum salts? what are they used in? what do they do?

A

systemic adjuvants which are used in vaccines to stimulate systemic immunity

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12
Q

what vaccines use aluminum salts?

A

DPT, pneumococcal, hep A, papilloma, anthrax, and rabies

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13
Q

the vaccine containing Freund’s adjuvants contains what dead bacterium? which type of adjuvant is it?

A

tuberculosis

systemic adjuvant

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14
Q

muramyl peptides are a systemic adjuvant which contain what?

A

a Mycobacterium cell wall fragment

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15
Q

what is a monophosphoryl lipid A? what type of adjuvant is it? which vaccine is it found in?

A

a detoxified endotoxin lipid

it is a mucosal adjuvant found in hep B vaccines

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16
Q

which method of vaccine administration will stimulate systemic immunity in the spleen, lymph nodes, and peripheral blood?

A

intramuscular or subcutaneous

17
Q

define what mucosal vaccines do

A

stimulate local immune responses to microbes at the point of entry into the body

18
Q

how do live-attenuated vaccines work?

A

use a weakened form of germ to create a long-lasting immune response

19
Q

what are examples of live-attenuated vaccines?

A

measles, mumps, rubella, rotavirus, smallpox, chickenpox, yellow fever

20
Q

how do inactivated vaccines work?

A

use killed version of germ and usually require several doses over time for continuous immunity

21
Q

what are examples of inactivated vaccines?

A

hep A, flu, polio, rabies

22
Q

how do Subunit, recombinant, polysaccharide, and conjugate vaccines work?

A

use specific pieces of germ to give a strong immune response

23
Q

what are examples of Subunit, recombinant, polysaccharide, and conjugate vaccines?

A

hep B, HPV, whooping cough, pneumococcal, meningococcal, shingles

24
Q

how do toxoid vaccines work?

A

use a toxin made by germ where immunity is produced to protect against said toxin, not the germ itself

25
Q

what are examples of toxoid vaccines?

A

Tdap

26
Q

define simple vaccine

A

contains only one kind of antigen

27
Q

define multivalent vaccine

A

contains two or more kinds of antigens that cause the same disease

28
Q

define polyvalent vaccine

A

contains two or more kinds of antigens that cause different diseases

29
Q

define single-dose vaccine

A

vaccine only needed once during life time

30
Q

define multiple-dosing regimen

A

several doses needed to get full protection

31
Q

define booster dose

A

needed to reinforce protection