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Nobody knows if lungworm was introduced by domestic livestock or if it was always here. There is increasing evidence though domestic sheep (and domestic goats) carry a lot of lungworm into the bighorn range and increase the chances of infection. Today, lungworm is everywhere, but it is the densities of the bacteria in areas where domestic sheep graze that are the problem. Lower densities of domestic sheep means lower densities of bacteria. Where there are less domestic sheep, generally it is less likely bighorns will contract pneumonia. That doesn't mean bighorn herds haven't contracted pneumonia, but overall there is a trend.