At what temperature do worms or Coccidia become active? We’ve had roller coaster weather, and have had a bit of snow melt the last two days but it’s going to be freezing tonight & subzero again this week. Of course the chickens poop in the melting snow, then drink from the puddles (yuck). I try to keep the poop cleaned up, and they have 3 sources of fresh water, but it’s like trying to clean with a toddler. Would a preventive worming be beneficial, or should I wait until I have symptoms, confirmation of parasites in fecal floats or warmer weather?