The short story was about how a disease, perhaps from a parasitic fungus, took over people’s minds and made them climb telephone poles and trees so when their heads exploded the spores would spread. People had to stay indoors.
For some reason I thought it was a Tim Pratt story, but I cannot find it. I also have a recall that it might have been a podcast episode on either Pseudopod or Escapepod. I looked through both their lists and cannot find a match. This would have been approximately 10 years ago, give or take.
I think I may be confusing two stories. Part of it is clearly based on my recollection of "On a Blade of Grass" by Tim Pratt, but there’s definitely another story with people climbing poles and exploding, which is the one I’m interested in. The Pratt story is great, but not the one I’m interested in.