Vaccines Flashcards
Stimulation with antigen to develop immunologic defenses against a future exposure
Active immunization
Induction of provision of immunity by any mean, active or passive
Immunization
Administration of preformed antibodies
Passive immunization
Occurs during infection
Natural active
Injecting or taking antigens by mouth
Artificial active
Mother to child placenta or milk
Natural passive
Injection of antitoxins given
Artificial passive
Results in the rapid appearance of low IgG antibody titers
Extrafollicular response
IgG titers peak after how many weeks?
4 weeks
2 weeks-4 weeks
Reactivates immune memory and results in a rapid <7 days increase of IgG antibody titer
Booster
Prevent or reduce infections by extra and intracellular agents and clear extracellular pathogens
Antibodies
Reduce control and clear (not prevent) intracellular pathogens
CD8+ cells
Reduce control and clear (do not prevent) extra and intra cellular pathogens
CD4+ cells
Antibody mechanisms
Binding to enzymatic and active sites of toxins
Opsonization
Complement activation
Preventing viral binding and entry
Antigens in vaccines
Weakened pathogens
Killed pathogens
Protein parts of pathogens
When a critical portion of the community is immunized against a contagious disease most members of the community are protected against the disease because there is little opportunity for an outbreak.
Community herd immunity
Critical portion
At least 80% immunized
Immune globulins
IVIg Hep B immune globulin Rabies immune globulin Tetanus immune globulin CMV immune globulin Anti-D immune globulin (Rh)
Live attenuated vaccines
Viral mmr, varicella/zoster, yellow fever, rotavirus, intranasal influenza, vaccinia, oral polio
Bacterial BCG, oral typhoid
Weakened form of wild virus or bacteria, produces mild symptoms
Live attenuated
Cannot replicate, not as effective as live vaccines
Inactivated vaccines
Generally require 3-5 doses
Inactivated vaccines
Inactivated vaccine immune response
Mainly humoral
Boosters needed, titer may diminish with time
Inactivated
More durable immune response, which type of vaccine?
Live attenuated
Whole cell inactivated vaccines viral
Polio, hep a, rabies, influenza
Whole cell inactivated bacterial
Pertussis, typhoid, cholera, plague
Fractional inactivated
Subunit
Toxoid
Fragment of microbe, may be surface proteins or viral genes
Subunit
Examples of subunit vaccines
Hep B Influenza Acellular pertussis Hpv Anthrax
Toxin rendered not harmful
Toxoid
Toxoid examples
Diptheria
Tetanus
Polysaccharide vaccines types
Pure polysaccharide
Conjugate polysaccharide
Not consistently immunogenic in children <2 years
Pure Polysaccharide vaccines