Piroplasmosis Presents Problems for Przewalski Horses
Domesticated riding horses dwelling in the same regions of the Hustai National Park appear to resist the disease. These free-roaming horses belonging to nomadic populations have similar infection rates—but no deaths, said Katsuro Hagiwara, PhD, of the Rakuno Gakuen University School of Veterinary Medicine, in Hokkaido.
“Susceptibility to pathogens (like piroplasmosis) depends on the horse species,” Hagiwara said. “The wild horses (which we call locally ‘takhi’) in particular are highly susceptible to the responsible protozoa (Theileria equi). Nomadic horses do not progress to deadly diseases after infection as wild horses do.”
The reason for this difference is unclear, he said. But it does highlight the need for better surveillance of the takhi, which appear to be infected by local ticks after arriving in
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