Clinical neosporosis in a 4-week-old Hereford calf.
Most reports of neosporosis associated with abortion in cattle are in dairy cattle and infected calves do not survive beyond 7 days of age. This paper reports neosporosis in a 4-week-old Hereford calf. The calf was full term and appeared clinically normal at birth. At 2 weeks of age, the calf had weakened and was unable to nurse unassisted. The calf was killed at 4 weeks because of paralysis. The primary lesions were in the brain and were associated with Neospora caninum tachyzoites. The diagnosis was confirmed by immunohistochemical staining with anti-Neospora rabbit serum.
Dubey
J P
JP
Zoonotic Diseases Laboratory, Livestock and Poultry Sciences Institute, ARS USDA, Beltsville, MD 20705-2350.
Janovitz
E B
EB
Skowronek
A J
AJ
D000818:Animals; D016782:Apicomplexa / Q000302:isolation & purification*; D001921:Brain / Q000469:parasitology / Q000473:pathology; D002417:Cattle; D002418:Cattle Diseases / Q000469:parasitology* / Q000473:pathology; D005260:Female; D009132:Muscles / Q000469:parasitology / Q000473:pathology; D009336:Necrosis; D011528:Protozoan Infections / Q000469:parasitology / Q000473:pathology; D011529:Protozoan Infections, Animal