Childhood Immunizations: Core Concepts (Pediatrics)

Prepared for Pass the Shift (owner: Kristina, RN). Always follow your facility’s protocols, provider orders, and current references.

Always check the current schedule. U.S. childhood immunization recommendations are set through CDC/ACIP and have been revised several times in 2025–2026; the AAP also publishes its own schedule. This guide teaches concepts that stay stable. For exact ages, doses, and intervals, use the current CDC schedule (and your program’s required reference) — never memorize a table that may be out of date.

1. Overview: How Vaccines Work

Vaccines expose the immune system to an antigen (weakened or killed germ, a piece of it, an inactivated toxin, or instructions to make an antigen) so it makes memory cells and antibodies without the child having the disease.

: the body makes its own antibodies (vaccines, natural infection) — long-lasting
: ready-made antibodies given (maternal antibodies across the placenta and in breast milk, immune globulins like HBIG, RSV monoclonal antibodies) — immediate but temporary
: when enough people are immune, spread slows, protecting those who can’t be vaccinated (newborns, immunocompromised children)

2. Vaccine Types

Type	Examples	Key points
Live attenuated	MMR, varicella, rotavirus (oral), intranasal influenza (LAIV), yellow fever	Weakened live germ; strong immunity. Generally avoided in pregnancy and in significant immunosuppression. Two live injected vaccines not given the same day should be separated by ≥ 28 days
Inactivated / subunit / conjugate / toxoid	DTaP/Tdap (toxoids + pertussis parts), IPV (polio), hepatitis A and B, Hib, pneumococcal, meningococcal, HPV, inactivated influenza	Can’t cause infection; often need multiple doses and boosters. Conjugate vaccines help infants respond to sugar-coated bacteria (Hib, pneumococcal)
mRNA / other platforms	COVID-19	Recommendations have changed frequently; check current guidance
Monoclonal antibodies (passive)	Nirsevimab or clesrovimab for RSV	Not a vaccine, but on the infant schedule

3. Schedule Concepts (not the full table)

The infant series is concentrated in the first 2 years, when children are most vulnerable to diseases like pertussis, Hib, and pneumococcus
Combination vaccines reduce the number of shots
Minimum ages and intervals matter — doses given too early may not count. Never restart a series because of a delay; just continue (use the CDC catch-up table)
Some vaccines are age-limited (e.g., rotavirus has a maximum age for starting and finishing)
Multiple vaccines at one visit are safe and effective — separate injection sites by ~1 inch
Pre-adolescent visit (11–12 yr) commonly includes Tdap, HPV, and meningococcal; influenza is recommended annually from 6 months (check current guidance)
Pregnancy vaccines protect the newborn: Tdap (pertussis) each pregnancy, influenza, and seasonal RSV options — see the Maternity guides

4. Contraindications vs. Precautions

	Meaning	Examples
Contraindication	Do not give	Severe allergic reaction (anaphylaxis) to a previous dose or a vaccine component; live vaccines in pregnancy or severe immunodeficiency; encephalopathy within 7 days of a pertussis-containing vaccine (for DTaP/Tdap); history of intussusception or SCID (rotavirus)
Precaution	Weigh risks/benefits; often delay	Moderate or severe acute illness with or without fever; recent blood products/immune globulin (delay MMR/varicella); certain neurologic conditions
NOT contraindications (common myths)	Vaccinate	Mild illness (cold, low-grade fever, mild diarrhea), current antibiotics, prematurity (vaccinate by chronologic age for most vaccines), breastfeeding, recent exposure to illness, egg allergy (flu vaccine can be given with usual precautions per current guidance), a family history of adverse events, a pregnant household member (most vaccines)

Immunocompromised household contacts: most vaccines (including MMR and varicella) are still given to the child; precautions apply to some (e.g., avoid diaper contact after rotavirus — hand hygiene).

5. Administration — Priority Nursing Actions

Screen for contraindications/precautions every visit (allergies, illness, immune status, pregnancy for teens, recent blood products)
Give the current Vaccine Information Statement (VIS) before each vaccine (required by federal law for covered vaccines) and answer questions
Rights of medication administration; check expiration and storage (cold chain — refrigerator 2–8 °C/36–46 °F; varicella/MMRV often frozen per product)
Route and site:
- IM: vastus lateralis (anterolateral thigh) for infants and toddlers; deltoid for children ≥ ~3 yr (enough muscle mass). 90° angle; needle length by size (commonly ~5/8–1 inch for infants, 1–1.25 inch for older children) — no aspiration needed
- SubQ: e.g., MMR, varicella, IPV (can also be IM) — 45° angle, fatty tissue of the thigh or upper outer arm
- Oral: rotavirus
- Intranasal: LAIV
Comfort measures: hold the child upright (not restrained flat), breastfeeding or sweet solution in infants, distraction, topical anesthetic, inject the most painful vaccine last
Observe — fainting (syncope) is common in adolescents → have them sit or lie down for 15 minutes after vaccination
Document: vaccine, manufacturer, lot number, expiration, dose, route, site, date, VIS edition date and date given, administrator; enter in the state immunization registry (IIS)

6. Adverse Reactions

Common, expected: soreness, redness, swelling, low-grade fever, fussiness for 1–2 days; MMR/varicella may cause fever or rash ~1–2 weeks later
Comfort care: cool compress, fluids; acetaminophen or ibuprofen for discomfort after vaccination if needed (routine pre-medication isn’t recommended)
Anaphylaxis (rare, emergency): hives, swelling of face/lips, wheezing, hypotension, within minutes → IM epinephrine (anterolateral thigh), call for help, airway, positioning; every vaccination site must have epinephrine available
Report clinically significant adverse events to VAERS (Vaccine Adverse Event Reporting System). The Vaccine Injury Compensation Program exists for covered vaccines

7. Talking With Hesitant Families

Use a presumptive but respectful approach (“Today Maya is due for…”) and listen to concerns
Acknowledge feelings; give clear, honest information about benefits and risks; correct myths (e.g., MMR does not cause autism — extensively studied)
Document refusal per policy (e.g., AAP refusal form); keep the door open at every visit
Point to trusted sources: CDC, AAP (HealthyChildren.org), your state health department

8. Memory Aids

Live vaccines: “MMR, Varicella, Rota, Nasal flu (and Yellow fever)” — avoid in pregnancy and severe immunosuppression; 28 days apart if not same day
“Mild illness? Still vaccinate. Moderate–severe illness? Delay.”
Site: “Thigh for tiny, deltoid when bigger”
“VIS before, lot # after”
Preemies: chronologic age for vaccines (vs. corrected age for development)
Teen + needle = sit for 15 (syncope)

9. NCLEX-Style Practice Questions

1. A 12-month-old is due for vaccines and has a runny nose and temperature of 37.8 °C (100 °F). What should the nurse do?

A. Postpone all vaccines for 2 weeks
B. Give the scheduled vaccines
C. Give only half doses
D. Give vaccines only after a course of antibiotics

Answer: B. Mild illness with or without low-grade fever is not a contraindication. Delaying leaves the child unprotected.

2. Which site is preferred for an IM vaccine in a 6-month-old?

A. Deltoid
B. Dorsogluteal
C. Vastus lateralis
D. Ventrogluteal

Answer: C. The vastus lateralis (anterolateral thigh) has the most developed muscle mass in infants and young toddlers. The deltoid is used once muscle mass is adequate (often ~3 years).

3. In which situation should the nurse hold a live vaccine (MMR) and consult the provider?

A. The child’s mother is pregnant
B. The child is taking amoxicillin for an ear infection
C. The child is receiving high-dose chemotherapy for leukemia
D. The child had mild soreness after a previous DTaP

Answer: C. Live vaccines are generally contraindicated in significant immunosuppression. A pregnant household member (A), antibiotics (B), and prior mild local reactions (D) are not contraindications.

4. Five minutes after vaccination, a child develops hives, lip swelling, and wheezing. What is the nurse’s first action?

A. Give oral diphenhydramine
B. Give IM epinephrine per protocol
C. Apply ice to the injection site
D. Document the reaction in VAERS

Answer: B. These are signs of anaphylaxis; IM epinephrine is first-line and life-saving. Antihistamines are adjuncts. Reporting comes after stabilization.

5. Which information must the nurse document after giving a vaccine? Select all that apply.

A. Manufacturer and lot number
B. Site and route
C. VIS edition date and date provided
D. Parent’s insurance plan
E. Name and title of the person giving the vaccine

Answer: A, B, C, E. Federal requirements and best practice include vaccine details, site/route, VIS information, and the administrator. Insurance information (D) isn’t part of vaccine documentation.

References

American Academy of Pediatrics. (n.d.). Immunizations. HealthyChildren.org. Retrieved October 15, 2026, from https://www.healthychildren.org/English/safety-prevention/immunizations/Pages/default.aspx

Centers for Disease Control and Prevention. (n.d.). Child and adolescent immunization schedule by age. Retrieved October 15, 2026, from https://www.cdc.gov/vaccines/hcp/imz-schedules/child-adolescent.html

Centers for Disease Control and Prevention. (n.d.). General best practice guidelines for immunization. Advisory Committee on Immunization Practices. Retrieved October 15, 2026, from https://www.cdc.gov/vaccines/hcp/imz-best-practices/index.html

National Council of State Boards of Nursing. (2026). 2026 NCLEX-RN test plan. https://www.nclex.com/test-plans.page