Chapter 20: Immunizations Flashcards
FDA Approval Based On:
Safety and efficacy for the indication
Advisory Committee on Immunization Practices
(ACIP)
Provides recommendations for vaccine administration in children and adults
CDC
Approves ACIP recommendation and publishes them in Morbidity and Mortality Weekly Report (MMWR) and the Pink Book
Antibodies
Are naturally produced to provide immunity against antigens.
When an antigen is detected the body produces antibodies and destroys the antigen
Immunoglobulin is the medical term for antibody
Active Immunity
When the person’s own immune system produces antibodies to fight an infection or in response to vaccine administration
Passive Immunity
Is acquired from someone else
- Mother to baby
- IVIG therapy
Types of Vaccines: Live Attenuated
“Weakened” Vaccines
Produced by modifying a disease producing “wild” virus. They have the ability to replicate and produce immunity but do not cause illness
CI: immunocompromised and pregnant patients
Types of Vaccines: Inactivated
Made up of either a whole virus or bacterium or fractions of both. Immunity from this type of vaccine can diminish over time and a supplement dose may be required
Polysaccharide Vaccines
Inactivated
Polysaccharide molecules taken from the outside layer of encapsulated bacteria. These vaccines do not get a good response in children <2
E.g pneumococcal polysaccharide vaccine (pneumovax 23)
Conjugate Vaccines
Use polysaccharide molecules from outside layer of encapsulated bacteria and join the molecules to carrier proteins. Conjugation increases response in infants
E.g pneumococcal conjugate (Prevnar 13)
Recombinant Vaccines
A gene segment of a protein from the organism is inserted into the gene of another cell, such as a yeast cell, where it replicates
E.g Gardasil, Flublock
Toxoid Vaccines
Targets a toxin produced by the disease
E.g Tetanus toxoid vaccine
mRNA vaccines
Gives instructions to the body’s cells (in the form of mRNA) to produce a protein specific to the pathogen which triggers and immune response
E.g select Covid-19 vaccines
Common Live Vaccines
MICRO-VY M- MMR I- Intranasal flu C- Cholera R- Rotavirus O- Oral Typhoid V- Varicella Y- Yellow fever
Interval between MMR or Varicella and antibodies
A minimum of 3 months up to 11 months
Live vaccines and TB skin test
To reduce the risk of false negative
- give the live vaccine on the same day as the skin test
- Wait 4 weeks after a live vaccine to perform skin test
- Administer skin test wait 48-72 hours to get the result then give live vaccine
Invalid CI to Vaccines
- Mild acute illness (slight fever, mild diarrhea)
- Current antimicrobial therapy (exceptions: varicella, live flu, oral typhoid vaccine)
- Previous local skin reaction
- Allergies: bird feathers, PCN, allergies to products not in the vaccine
- Pregnancy (except live vaccines) breastfeeding and preterm birth
- Recent TB skin test
- Immunosuppressed person in the household, recent exposure to the disease
- family hx of adverse events to the vaccine
Vaccines for Special Groups: Infants and Children
- 3 doses Hep B started at birth
- Others start at 2 months: Prevnar 13, Dtap, Hib, Polio, Rotavirus
- Live vaccines start at >=12 months: MMR and Varicella
- no polysaccharide before 2
Vaccines for Special Groups: Adolescents and Young Adults
- Meningococcal Vaccine (2 doses; 1 at 11-12 and 1 at 16 or 1st yr college students in residential housing if not previously vaccinated)
- HPV 11-12 years (2 or 3 doses depending on start date)
- Tdap 1st dose at >11 yrs
