Vaccination & Immunity Types
Understanding how vaccines create long-term protection through memory cells
Two Types of Immunity
ACTIVE Immunity
What Happens:
Body MAKES its own antibodies
Creates MEMORY CELLS
Duration:
LONG-TERM
(Years to Lifetime)
Sources:
Natural:
Getting infected with a disease
Artificial:
Getting vaccinated
PASSIVE Immunity
What Happens:
Antibodies ACQUIRED from outside
NO MEMORY CELLS produced
Duration:
SHORT-TERM
(Weeks to Months)
Sources:
Breast Milk:
Mother's antibodies protect baby
Placenta:
Antibodies cross during pregnancy
Medical Injection:
Anti-venom, immunoglobulin
EXAMINER TRAP:
Students often confuse vaccination (ACTIVE) with anti-venom (PASSIVE). Remember: Vaccines train YOUR immune system to make antibodies. Anti-venom gives you PRE-MADE antibodies.
Key Takeaways
Active Immunity:
- • Body makes antibodies + memory cells
- • LONG-TERM protection
- • From infection OR vaccination
Passive Immunity:
- • Antibodies from outside source
- • SHORT-TERM (no memory cells)
- • Breast milk, placenta, anti-venom
Secondary Response (THE EXAM FAVORITE!):
- • ⚡ FASTER response time
- • 📈 HIGHER antibody levels
- • 🛡️ Pathogen destroyed before symptoms appear
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