Vaccine Immunity
Two doses of Pfizer, 30 days ago
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Evidence-based calculations Used in clinical settings worldwide Regular monitoring recommended
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Why: This calculation helps assess important health parameters for clinical and personal wellness tracking.
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Sample Scenarios
💉 Vaccination History
👤 Personal Factors
🏃 Lifestyle Factors
For informational purposes only — not medical advice. Consult a healthcare professional before acting on results.
🏥 Health Facts
— WHO
— CDC
Understanding Vaccine Immunity
Vaccine immunity refers to the protection against disease that develops after vaccination. This protection involves antibodies (immediate defense) and memory cells (long-term immunity). Antibody levels typically peak 2-4 weeks after vaccination and then gradually decline over months, though cellular immunity often persists longer.
Key Concepts
- • Peak immunity: Highest protection, 2-4 weeks post-dose
- • Waning immunity: Gradual decline in antibody levels
- • Half-life: Time for antibody levels to drop by 50%
- • Hybrid immunity: Enhanced protection from vaccination + prior infection
Protection Types
- • Infection protection: Preventing symptomatic disease
- • Severe disease: Preventing hospitalization
- • Death protection: Preventing fatal outcomes
- • Transmission: Reducing spread to others
Vaccine Technologies Compared
| Vaccine Type | Peak Efficacy | Half-Life | Technology |
| Pfizer-BioNTech (mRNA) | 95% | ~90 days | mRNA |
| Moderna (mRNA) | 94% | ~95 days | mRNA |
| Johnson & Johnson | 72% | ~120 days | Viral Vector |
| AstraZeneca | 76% | ~100 days | Viral Vector |
| Novavax | 90% | ~85 days | Protein Subunit |
| Sinovac (CoronaVac) | 70% | ~80 days | Inactivated |
Factors Affecting Immunity
Positive Factors
- ✓ Multiple doses
- ✓ Booster vaccination
- ✓ Prior infection (hybrid)
- ✓ Good sleep
- ✓ Regular exercise
Negative Factors
- ✗ Advanced age
- ✗ Immunocompromised
- ✗ Smoking
- ✗ Obesity
- ✗ Poor sleep/high stress
Booster Timing
- • 4-6 months typically
- • Earlier if high-risk
- • When protection <50%
- • Before travel/events
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