Cholera WASH Intervention

The WASH intervention suppresses environmental transmission. A value of 0 is a no-op and a value of 1.0 is 100% suppression.

We create a scenario with 10 identical nodes with 5 million individuals each, and a CBR of 40. And we turn off contact transmission. We unleash an outbreak at t=40. We also add a "New Infections" reporting channel and plot literally and cumulatively.

With 10 identical nodes we "sweep" by using different values of WASH in each node. First, from 0 to 1.0:

Observations: 100% WASH eliminates transmission (cyan flat line) as we'd expect. The other values achieve a range of suppression of incidence as we might expect, though the results are perhaps more logarithmic than linear to the naked eye.

Since most of the discernible effect happens after ~90%, let's "sweep" from 90% to 100%:

Below is a non-cumulative plot, first sweeping from 0 to 1.0:

Then from 0.9 to 1.0:

and then zoomed in on the last two recurrent outbreaks which shows differentiation between WASH settings (0.9 to 1.0):