Richard Herd

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Fifty-five adult horses were necropsied over a 15-month period, and their worm burdens counted and speciated. Twenty-one species of Cyathostominae were recovered. Ten species: Cyathostomum catinatum, Cylicocyclus nassatus, Cylicostephanus longibursatus, Cyathostomum coronatum, Cylicostephanus goldi, C. calicatus, C. minutus, Cylicocyclus leptostomus, C.(More)
Prevalence and infection patterns of Cryptosporidium and Giardia infections in horses were studied by a direct immunofluorescence staining method. Faecal examinations of 222 horses of different age groups revealed Cryptosporidium infection rates of 15-31% in 66 foals surveyed in central Ohio, southern Ohio and central Kentucky, USA. Only 1 of 39 weanlings,(More)
Faecal samples were collected weekly over a 3 month period from 0- to 20-week-old calves on an Ohio dairy farm, and examined for Cryptosporidium oocysts and Giardia cysts by a quantitative direct immunofluorescence assay. Oocysts and cysts were detected as early as 4 days of age. Shedding of Cryptosporidium oocysts peaked at 1 week and was low by 3 weeks.(More)
Nine- to 10-month-old Florida Native, St. Croix and Dorset/Rambouillet sheep were infected with Haemonchus contortus. The primary infection was terminated by anthelmintic treatment 9 weeks later and animals were then reinfected with H. contortus. Dorset/Rambouillet sheep showed higher fecal egg counts and decreased packed cell volumes and plasma protein(More)
The prevalence of Cryptosporidium and Giardia infections in pigs was investigated by the use of a direct immunofluorescence assay on two Ohio farms with different management systems. Cryptosporidium and Giardia infections were detected only in weanlings on the farm with slotted and wire floors, but in both weanlings and nursing piglets on the farm with(More)
Giardia and Cryptosporidium infections were diagnosed by immunofluorescence assay on two Ohio dairy farms with calf diarrhea problems. On the first farm, all nine diarrheic calves sampled once in June had Giardia cysts in their feces. On the second farm, all five diarrheic calves examined at the beginning of the diarrhea outbreak in March had Giardia(More)
Efficacies of albendazole and fenbendazole in suppressing Giardia cyst output of infected calves were evaluated in two clinical trials. In the first trial, 18 naturally infected calves were allocated to an untreated control group (n = 9) and an albendazole-treated group (n = 9). Calves in the treated group were given 20 mg/kg-1 oral albendazole once daily(More)