Experimental infection of Strongyloides westeri in parasite-free ponies

The prepatent period of Strongyloides westeri experimental infection in ponies was 6 to 10 days in pony foals and 11 to 13 days in pony yearlings. The infection stimulated moderate inflammation in the anterior one-third of the small intestine in pony foals. Pony yearlings and Quarter Horse foals lost the infection and were resistant to reinfection. The loss of infection was associated with a neutrophilia in Quarter Horse foals and an increase in β-globulin in pony yearlings.