\djde{The strict seasonality in Baca\"er's Figure 2 is very compelling. This could happen from demographic stochasticity sustaining transients, but only if the damping period happens to be exactly one year. I don't know if we can constrain the parameters sufficiently to rule that out (and we would need vital dynamics and/or decay of immunity to even try), but an exactly annual period is much more likely to arise from seasonal forcing. Digging into this seems like a rabbit hole that is well outside the intended scope of this paper; it would certainly have to involve fitting all 15 annual epidemics that Baca\"er shows and figuring out what other useful information is in all those reports that he cites. But it would be fun to investigate, perhaps in another paper.} \swp{Definitely another paper...}
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