R₀

Measles Outbreak Transmission and Immunity Simulator

Epidemiological SEIR Public Health Modeling Workbench
Intervention Controls Pennsylvania Outbreak
Public Health Alert: R₀ for measles is 12–18. Minimum herd immunity threshold is 95% (0.95).
Community MMR Coverage 88%
50% Sub-threshold 95% Herd Target 99% Fully Immune
Quarantine Speed 4 days
Time from symptom onset to isolation
Contact Tracing Efficiency 70%
Exposed secondary contacts quarantined early
Initial Population Scale 10,000
Outbreak Scenarios
Jefferson County Context: In Sept 2026, Pennsylvania reported 676 cases state-wide and 3 measles-associated fatalities, including an unvaccinated woman in Jefferson County with pulmonary complications.
LIVE TRANSMISSION GRID Click canvas to introduce an exposure cluster
Day 0 / 90
Speed: 2x
Particles: 200 representative nodes
EPIDEMIOLOGICAL CURVE DYNAMICS (SEIR) Calculated Daily Incidence
Susceptible (S)
Exposed (E)
Infectious (I)
Recovered / Immune (R)
Deceased (D)
Epidemic Telemetry Simulating
Containment Assessment
Contained with active intervention
Effective R_eff suppressed below 1.0
Peak Concurrent Infections
412
Maximum hospital / ICU surge impact
Total Outbreak Cases
1845
18.5% attack rate in non-immune
Cumulative Fatalities
3
Measles case fatality rate (0.16%)
Herd Immunity Threshold (HIT)
0.95
Current: 88% Req: 95.0%
Calculation Model: Measles basic reproduction number $R_0 = 15.0$, latent period $\sigma^{-1} = 10\text{d}$, infectious period $\gamma^{-1} = 8\text{d}$. County isolation rate $\theta$ attenuates secondary transmission.
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