Vaccinations flashies Flashcards
purpose of vaccines
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
factors allowing vaccines to be effective?
- 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
herd immunity
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)
passive immunization
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
active immunization
delayed but more permanent
example is natural exposure to pathogens and vaccines
combined passive-active immunization
give immediate and lasting protection
ex/ tetanus,
rabies**must be given in different sites of body so they don’t combine with each other
how to make vaccine?
whole or part of microorganisms administered to prevent infectious disease
isolate something that:-does not cause disease-does cause immune response
types of vaccines?
acellular
killed organisms
attenuated-
toxoid
mimic
subunit
DNA plasmid
killed organism vaccine?
inactivated or killed microorganism
ex/ polio
acelllular vaccine?
use antigen part of disease causing organism
ex/ DTap
attenuated vaccine?
can be attenuated by environmental conditions or genetic engineering
reduce virulence but still keep it viable
toxoid vaccine?
made from inactivated toxic compounds that cause illness rather than the micro-organism
ex/ tetanus
mimic vaccine?
use organisms similar to virulent one but doesn’t cause harm
ex/ vaccinia, BCG for M. tuberculosis
subunit vaccine?
utilizes techniques of genetic engineering
requires adjuvant (keeps vaccine in certain area)
uses subunit of virulent organism
DNA plasmid vaccine?
mimics live attenuated vaccine preparation-circular DNA plasmids expressing specific proteins injected with presentation of protein to immune system
ex/ HIV in developmentvaccinia vector