Vaccinations flashies Flashcards

1
Q

purpose of vaccines

A

provide an individual with the PRIMARY immune response to pathogen- so if exposed again you have memory without having contracted the disease

population–> eradication of disease, control of infectious diseases worldwide

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2
Q

factors allowing vaccines to be effective?

A
  • doesn’t cause latency
  • doesn’t have much antigenic variation- b/c then the vaccination would be worthless
  • doesn’t interfere with host immune response- doesn’t down regulate immune response

vaccines also most effective against infections that are limited to human hosts

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3
Q

herd immunity

A

sufficient number of immune individuals in a population-to stop transmission of infection

**proportion depends on severity of infection (so if the infection is very easily infectious, then a high proportion of the population must be immune to maintain herd immunity)

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4
Q

passive immunization

A

uses pre-synthesized antibodies (human Ig’s) -prevent disease after known exposure

  • protect immunosuppressed patients
  • ex/ snake bite anti-venom (IgG that is specific for venom)

also, passive transfer of mom Abs to child

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5
Q

active immunization

A

delayed but more permanent

example is natural exposure to pathogens and vaccines

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6
Q

combined passive-active immunization

A

give immediate and lasting protection

ex/ tetanus,

rabies**must be given in different sites of body so they don’t combine with each other

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7
Q

how to make vaccine?

A

whole or part of microorganisms administered to prevent infectious disease

isolate something that:-does not cause disease-does cause immune response

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8
Q

types of vaccines?

A

acellular

killed organisms

attenuated-

toxoid

mimic

subunit

DNA plasmid

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9
Q

killed organism vaccine?

A

inactivated or killed microorganism

ex/ polio

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10
Q

acelllular vaccine?

A

use antigen part of disease causing organism

ex/ DTap

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11
Q

attenuated vaccine?

A

can be attenuated by environmental conditions or genetic engineering

reduce virulence but still keep it viable

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12
Q

toxoid vaccine?

A

made from inactivated toxic compounds that cause illness rather than the micro-organism

ex/ tetanus

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13
Q

mimic vaccine?

A

use organisms similar to virulent one but doesn’t cause harm

ex/ vaccinia, BCG for M. tuberculosis

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14
Q

subunit vaccine?

A

utilizes techniques of genetic engineering

requires adjuvant (keeps vaccine in certain area)

uses subunit of virulent organism

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15
Q

DNA plasmid vaccine?

A

mimics live attenuated vaccine preparation-circular DNA plasmids expressing specific proteins injected with presentation of protein to immune system

ex/ HIV in developmentvaccinia vector

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16
Q

thimersol

A

used as preservative in vaccines

can be converted to methyl-mercury (neurotoxin)

no longer used

17
Q

adjuvants

A

bring antigen into contact with immune system and keep the subunits flocked in the area so the APC can pick them up

decrease the toxicity of certain antigens

provide solubility to some vaccine components

18
Q

aluminum hydroxide

A

only FDA approved adjuvant

clumps with antigen to keep it at the injection site

19
Q

immunization schedule for child

A

produce immunity to virulent organisms likely to be encountered early in life

consider:
-timing of likely exposure

  • immunological maturity of child
  • passively transferred antibodies
  • boosters for priming
20
Q

parenteral route?

A

subQ, IM, or intradermal

stimulates IgG

21
Q

oral route?

A

stimulates IgA (b/c IgA is associated with mucosal immunity)

22
Q

contraindications to immunization?

A

febrile illness

immunosuppressive therapy

recent blood transfusion

simultaneous vaccination of another vaccine

immunodeficiency

pregnancy

leukaemia or lymphoma

23
Q

vaccines for special populations?

A

influenza - children and elderly

hep A, typhoid, west nile, yellow fever - travelers

rabies - animal workers

24
Q

adverse reaction to vaccines?

A

not totally safe-

no perfect vaccine **

undesirable side effects

25
Q

new vaccine strategy?

A

use recombinant DNA technology

26
Q

Potential problems with vaccines

A

clinically important epitopes may not be intact in vaccine

individual genetics may effect efficacy

some individuals may be genetically predisposed to adverse events

often work poorly in young infants or the elderly b/c they have an immunosuppression

27
Q

development of immune response to vaccine depends on ….

A

route

timing

use of adjuvants

previous exposure to infection