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Life cycle of Hepatozoon canis (Apicomplexa: Adeleorina: Hepatozoidae) in the tick Rhipicephalus sanguineus and domestic dog (Canis familiaris).
- Source :
-
The Journal of parasitology [J Parasitol] 2007 Apr; Vol. 93 (2), pp. 283-99. - Publication Year :
- 2007
-
Abstract
- The life cycle of the apicomplexan protozoon Hepatozoon canis in its natural hosts Rhipicephalus sanguineus (tick) and Canis familiaris (domestic dog) was studied in an experimental infection. Tick nymphs were fed on a naturally infected dog, or they were infected by percutaneous injection of blood. Dogs were inoculated by ingestion of adult ticks containing mature oocysts. Gamonts were in syzygy 24 hr after percutaneous injection of ticks. Early oocysts were detected 96 hr after nymph repletion, and mature oocysts in adult ticks were infective to dogs 40 days postmolt. Merogony was detected in dog bone marrow from 13 days postinoculation (PI) and included meronts containing 20-30 micromerozoites, and a second type with 2-4 macromerozoites. Monozoic cysts were observed in the spleen in conjunction with merogony. Gamontogony with infection of leukocytes by micromerozoites occurred from 26 days PI, and gamont parasitemia, which completed the life cycle, was detected 28 days PI. The length of the life cycle from nymphal attachment to parasitemia in dogs was 81 days. Increased body temperatures were evident from 16 to 27 days PI and paralleled the time of intensive bone marrow merogony. Skeletal pain and recumbency were manifested in 2 dogs. This study further elucidates the life cycle of H. canis and provides a sequential morphologic description of H. canis merogony, gamontogony, and sporogony.
- Subjects :
- Animals
Bone Marrow parasitology
Coccidiosis parasitology
Coccidiosis transmission
Dog Diseases transmission
Dogs
Eucoccidiida ultrastructure
Female
Gerbillinae
Hemolymph parasitology
Leukocytes parasitology
Male
Merozoites growth & development
Merozoites ultrastructure
Microscopy, Electron, Scanning veterinary
Microscopy, Electron, Transmission veterinary
Nymph parasitology
Oocysts growth & development
Oocysts ultrastructure
Parasitemia parasitology
Parasitemia veterinary
Rabbits
Spleen parasitology
Arachnid Vectors parasitology
Coccidiosis veterinary
Dog Diseases parasitology
Eucoccidiida growth & development
Life Cycle Stages
Rhipicephalus parasitology
Subjects
Details
- Language :
- English
- ISSN :
- 0022-3395
- Volume :
- 93
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- The Journal of parasitology
- Publication Type :
- Academic Journal
- Accession number :
- 17539411
- Full Text :
- https://doi.org/10.1645/GE-494R.1