Dry Rot
Well-Known Member
DR - interesting.
I think individual horse resistance is an interesting topic as I've had 2 here that never had a single egg in a count over several years, one of which had a companion from a rescue center that often had counts over 1000 initially (a whole nother subject of whether poor worming in youngters can make them perminantly prone). The nil count and the 1000 count horse were out 24/7 for years and never grazed more than a few meters apart (we called the companion his shadow)
Other random fact is that in humans they think the lack of worms currently is the cause for lots of allergies (ie our bodies are designed to be fighting a low level of infestation and have gone 'wonky' when we are not) and indeed they are trialing allergy treatments that involve giving people worms again as a few worms causes a lot less damage than nasty allergies!
Worms (and other parasites) have certainly lived reasonably contentedly with their hosts for a VERY long time. It is not in the interests of the parasite to kill it's host!
It is certainly true that some exposure to dirt builds up a natural resistance. There used to be an old saying that you had to eat a peck of dirt before you die! (1 peck = 2 gallons).