I found the stats again, you can see it's present in raw milk, (the cow would need to be sick though, your cow might be perfectly healthy, although signs of Johne's disease only show up long after the animal has been infected, 2-3 years later). I don't think checking a cow for JD is that expensive either.
I don't know if the use of raw milk in Ireland is related, I also don't know what exactly else is done to milk outside of pasteurisation, there's a number of steps commercial milk goes through before it's pasteurised, which might be lowering the amount of MAP, not sure.
