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med.herd-immunity-threshold Calculator
Calculates the herd immunity threshold from R₀ and the vaccine efficacy, showing the minimum vaccination coverage needed to prevent endemic spread. For COVID-19 with R₀ ≈ 5–6 (Delta), the threshold is 80–85% — for measles with R₀ ≈ 15, it's 93%.
Inputs
R0 Basic
Count of items or occurrences.
Vaccine Efficacy Pct
Reference formula or conversion factor shown for context.
Current Immune Pct
Rate of charge flow (A). I = V/R. Above ~100 mA through the body can be lethal. Fuses protect against overcurrent.
Results
herd immunity threshold HIT
Sample size or count used in the calculation.
vaccination coverage needed Vc
The fraction of the total that is protected, tested, or accounted for. Higher coverage reduces risk of gaps.
Rt after target coverage
The fraction of the total that is protected, tested, or accounted for. Higher coverage reduces risk of gaps.
HIT = 1 - 1/R₀
Reference formula or conversion factor shown for context.
status
Current state of the system, process, or metric — typically pass/fail, healthy/warning/critical, or a descriptive classification.
examples
Reference formula or conversion factor shown for context.