Trachoma Teaching Models

Interactive models for teaching the transmission dynamics and control of ocular Chlamydia trachomatis (trachoma).

Apps

Simple SIS model

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A minimal two-compartment (S, I) model showing why trachoma is modelled as SIS rather than SIR, with an explanation tab covering the equations, R0, and endemic equilibrium.

Stuck on the exercise? Download the solution code.

SIS ladder model (partial immunity)

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Adds an infection-history "ladder" (partial immunity via rung-dependent recovery and infectiousness) and irreversible disease progression (scarring, trichiasis), with no age structure.

Stuck on the exercise? Download the solution code.