The hidden model is a two virus model with crossover and the possibility of vaccination against virus 1.

After: Zarnitsyna VI, Bulusheva I, Handel A, Longini IM, Halloran ME, Antia R (2018). Intermediate levels of vaccination coverage may minimize seasonal influenza outbreaks. PLoS ONE 13(6): e0199674. https://doi.org/10.1371/journal.pone.0199674

The hidden model is available as a COPASI (https://copasi.org/) simulation in our GitHub repo at https://github.com/jpsluka/modeling-the-invisible-workshop in the "HiddenModel_source" directory.