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Vaccine Reactions / Storage

NCLEX Review Guide: Infectious Diseases, Immunizations, Vaccine Reactions & Storage

Infectious Disease Fundamentals

Chain of Infection

Infectious agent - pathogenic microorganisms that cause disease in susceptible hosts
Reservoir - where pathogens live and multiply (humans, animals, environment)
Portal of exit - how pathogens leave the reservoir (respiratory, GI, GU, blood, skin)
Mode of transmission - how pathogens spread (contact, droplet, airborne, vector-borne)
Portal of entry - how pathogens enter new host (same routes as exit)
Susceptible host - person at risk for infection due to compromised immunity

Key Points

Breaking any link in the chain prevents infection transmission
Hand hygiene is the most effective way to break the chain

Immunization Principles

Types of Immunity

Active Immunity	Passive Immunity
Body produces antibodies	Receives pre-formed antibodies
Long-lasting protection	Temporary protection
Vaccines, natural infection	Immunoglobulins, maternal antibodies

Vaccine Types

Live attenuated vaccines - weakened live viruses (MMR, varicella, rotavirus)
Inactivated vaccines - killed pathogens (IPV, hepatitis A, influenza injection)
Toxoid vaccines - inactivated toxins (tetanus, diphtheria)
Subunit vaccines - parts of pathogen (hepatitis B, HPV)

Clinical Alert: Live vaccines are contraindicated in immunocompromised patients and pregnant women

Vaccine Administration Guidelines

Standard Procedures

Verify patient identity and obtain informed consent
Review immunization history and contraindications
Select appropriate needle size (infants: 5/8", adults: 1-1.5")
Administer in vastus lateralis (infants) or deltoid (adults)
Document vaccine lot number, expiration date, and site
Observe for immediate reactions (15-20 minutes)

Memory Aid: Vaccine Sites

"Very Little Deltoids" - Vastus Lateralis for infants, Deltoid for adults

Contraindications & Precautions

Absolute contraindications: severe allergic reaction to previous dose, severe immunodeficiency
Precautions: moderate/severe acute illness, recent blood product transfusion
Pregnancy contraindicated for live vaccines only
Minor illness without fever is NOT a contraindication

Vaccine Reactions

Common Reactions

Local Reactions	Systemic Reactions
Pain, redness, swelling at injection site	Fever, irritability, drowsiness
Usually mild and resolve in 1-2 days	Typically occur within 24-48 hours
Treat with cool compresses, analgesics	Treat with acetaminophen/ibuprofen

Serious Adverse Events

Anaphylaxis - rare but life-threatening; occurs within minutes
Febrile seizures - associated with high fever, especially MMR
Shoulder injury (SIRVA) - from improper injection technique
Report all serious events to VAERS (Vaccine Adverse Event Reporting System)

Clinical Scenario

A 15-month-old receives MMR vaccine. Parents should be taught to expect possible fever and rash 7-12 days post-vaccination, which indicates immune response, not infection.

Vaccine Storage & Handling

Temperature Requirements

Refrigerated vaccines: 36-46°F (2-8°C) - most routine vaccines
Frozen vaccines: -58 to 5°F (-50 to -15°C) - varicella, zoster, MMRV
Use continuous temperature monitoring with data loggers
Never store vaccines in door compartments - temperature fluctuations occur

Memory Aid: Storage Temperatures

"Refrigerate Most, Freeze Few" - Most vaccines refrigerated, only varicella-containing vaccines frozen

Cold Chain Management

Maintain proper temperatures from manufacturer to administration
Use qualified refrigeration units with temperature monitoring
Develop emergency procedures for equipment failure
Document temperature logs twice daily
Never use expired vaccines - check dates before administration

Emergency Protocol: If cold chain is broken, isolate affected vaccines, contact manufacturer/health department, do not discard until advised

Commonly Confused Concepts

Live vs. Inactivated Vaccines	Key Differences
Live vaccines	Can cause mild disease, contraindicated in immunocompromised
Inactivated vaccines	Cannot cause disease, safe for immunocompromised patients

Contraindication vs. Precaution	Action
Contraindication	Do NOT give vaccine
Precaution	Weigh risks/benefits, may defer vaccination

Study Tips & Memory Aids

NCLEX Success Tips

"Safety First" - Always assess for contraindications before administering
"Document Everything" - Lot numbers, sites, reactions are legally required
"When in Doubt, Don't Give" - Consult provider if unsure about contraindications
"Cold Chain = Effective Vaccine" - Proper storage ensures vaccine potency

Quick Check Questions

☐ Can you name the 6 links in the chain of infection?
☐ Which vaccines are live and contraindicated in pregnancy?
☐ What temperature range is required for refrigerated vaccines?
☐ How long should patients be observed after vaccination?

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