but I think the bulk of the problem is probably a few steps up on the food chain. My understanding is that climate change is possibly a bigger factor. The eve

but I think the bulk of the problem is probably a few steps up on the food chain. My understanding is that climate change is possibly a bigger factor. The ever warmer winters means that less of the eggs die off in sub-freezing weather. More of the early life cycle hosts (e.g. small mammals like mice, rats, voles) survive the winter.