Neospora caninum infection in a free-ranging raccoon (Procyon lotor) with concurrent canine distemper virus infection.
During a canine distemper virus (CDV) outbreak in raccoons (Procyon lotor) from Cook County, Illinois, a juvenile female suffering from seizures was killed and necropsied. Gross and histologic findings of necrotizing encephalitis and proliferative bronchopneumonia were attributed to CDV infection and considered the cause of clinical signs. A section of cerebellum stained immunohistochemically for Neospora caninum revealed an approximately 40 microm diameter, round to oval cyst with a 2- to 3-microm-thick wall and filled with 1-2 microm diameter, round to oval bradyzoites. Polymerase chain reaction (PCR) results were positive for N. caninum using DNA extracted from the brain. Specific PCR for the closely related organisms Toxoplasma gondii and Hammondia heydorni yielded negative results. This case report provides histologic, immunohistochemical, and molecular evidence that raccoons are a naturally occurring intermediate host of N. caninum.
Lemberger
K Y
KY
University of Illinois Zoological Pathology Program, Loyola University Medical Center, Building 101, Room 0745, 2160 South First Avenue, Maywood, Illinois 60153, USA. klember@lumc.edu
Gondim
L F P
LF
Pessier
A P
AP
McAllister
M M
MM
Kinsel
M J
MJ
D000818:Animals; D002531:Cerebellum / Q000469:parasitology; D003048:Coccidiosis / Q000150:complications / Q000662:veterinary*; D016054:DNA, Protozoan / Q000302:isolation & purification; D004216:Distemper / Q000150:complications*; D004217:Distemper Virus, Canine; D005260:Female; D007150:Immunohistochemistry / Q000662:veterinary; D018688:Neospora / Q000235:genetics / Q000276:immunology / Q000302:isolation & purification*; D016133:Polymerase Chain Reaction / Q000662:veterinary; D011821:Raccoons / Q000469:parasitology* / Q000821:virology
D016054:DNA, Protozoan