Protozoa VI: Apicomplexa Flashcards
What is the life cycle for Sarcocystis spp.?
Indirect life cycle
Describe the generalized life cycle for the Sarcocystis spp. definitive host
PPP: 7-14 days
No merogony
Gametogony
Describe the generalized life cycle for the Sarcocystis spp. intermediate host
Merogony
No gametogony
What are definitive hosts for Sarcocystis cruzi?
Dogs, wolves, coyotes, racoons, foxes, hyena
What are intermediate hosts for Sarcocystis cruzi?
Cattle, ox, bison
What are the infective stages to the definitive host for Sarcocystis cruzi?
Sarcocyst (with bradyzoites)
What are the infective stages to the intermediate host for Sarcocystis cruzi?
Oocyst/sporocysts
What is the route of infection for the definitive host of Sarcocystis cruzi?
Ingesition of tissue cyst (sarcocyst) containing bradyzoites
What is the route of infection for the intermediate host of Sarcocystis cruzi?
Ingestion of oocysts/sporocysts in environment
What is the site of infection in the definitive host for Sarcocysti cruzi?
Intestinal tract
What is the site of infection in the intermediate host for Sarcocystis cruzi?
Extraintestinal (heart, skeletal muscle, tongue, esophagus, diaphragm)
What is the pathology/clinical signs for Sarcocystis cruzi in the definitive host?
Asymptomatic
No immunity
What is the pathology/clinical signs for Sarcocystis cruzi?
Acute
Anorexia, pyrexia, anemia, weight loss
Abortion in final trimester
What are methods of diagnosis of Sarcocystic cruzi in the intermediate host?
Clinical signs
Presence of sarcocyst on histology
Antibody detection
What are methods of diagnosis of Sarcocystic cruzi in the definitive host?
Sporocysts/oocysts on fecal flotation
Usually free sporocysts
Oocysts is approximately double the sporocyst size
What is the treatment of Sarcocystis cruzi in the intermediate host?
Prophylactic: amprolium, salinomycin, deccox, monensis, stenoral
What are the control measures for Sarcocystis cruzi?
Predator/prey control
Avoid fecal contamination of bedding/food/water by carnivores
Avoid feeding dogs uncooked meat/offal
Bury or incinerate dead livestock
What is the definitive host of Sarcocystis neurona?
Opossums
What are intermediate hosts of Sarcocystis nerona?
Armadillo, raccoon, cat, skunk
What is the accidental host of Sarcocystis neurona?
Horse
What is Sarcocystis neurona an agent of?
Equine protozoal myeloencephalitis (EPM)
What are the infective stages for Sarcocystis neurona in the definitive host?
Sarcocyst (with bradyzoites) in an intermediate host, sporocyst
What are the infective stages for Sarcocystis neurona in the intermediate host?
Sporocyst, oocyst
What are the infective stages for Sarcocystis neurona in the accidental host?
Sporocyst, oocyst
What is the site of infection for Sarcocystis neurona in the direct host?
Intestinal tract
What are the sites of infection for Sarcocystis neurona in the intermediate host?
Skeletal muscle, tongue
What is the site of infection for Sarcocystis neurona in the accidental host?
CNS
What are the clinical signs of Sarcocystis neurona?
DH: none
IH: asymptomatic
AH: neurological problems
What are the methods of diagnosis for Sarcocystis neurona?
DH: oocyst/sporocysts on fecal flotation
IH: sarcocyst on histology, IFA, PCR
What is the method of diagnosing EPM?
Complete neurological exam
Equinr CSF/blood tests
What is the pathology of EPM?
Gross lesions confined to neural tissue
What are the FDA approved treatments of Sarcocystis neurona/EPM?
Ponazuril (Marquis)
Diclazuril (Protazil)
Combo sulfadiazine and pyrimethamine (ReBalance)
What are the methods of control for Sarcocystis neurona/EPM?
Protect feed/water sources from oppossum
Reduce road-kill around farm
What are other hosts of Sarcocystis spp.?
Ruminants
Wildlife: waterfowl- S. rileyi
What is the site of Cryptosporidium spp.?
Primarily gastrointestinal
Upper respiratory tract; bursa/proventriculus
What species is Crypotsporidium parvum associated with?
Ruminants (cattle)
What species is Cryptosporidium andersoni associated with?
Cattle
What species is Cryptosporidium bovis associated with?
Cattle
What species is Cryptosporidium canis associated with?
Dogs
What species is Cryptosporidium felis associated with?
Cats
What is the Cryptosporidium life cycle?
Direct life cycle
What is the infective stage of Cryptosporidium?
Sporulated oocyst
Where do Crypotsporidium oocysts sporulate?
Within the host
What are the routes of infection for Cryptosporidium?
Fecal-oral, autoinfection
What is the PPP for Cryptosporidium?
1 week or less
What is Cryptosporidium parvum the common cause of?
Intestinal disease in neonatal ruminants
What is the site of infection with Cryptosporidium parvum?
Ileum
What is the PPP of Cryptosporidium parvum?
3-6 days
What is the patent period of Cryptosporidium parvum?
1-2 weeks; self-limiting
What are the clinical signs of Cryptosporidium parvum?
Diarrhea
Depression
Anorexia
What is the pathology of Cryptosporidium parvum?
Loss of epithelial cells Villus atrophy Dehydration Electrolyte imbalance Impaired nutrient digestion, absorption
Describe Cyrptosporidium andersoni in mature cattle
No clinical disease
Chronic subclinical infections
Site of infection: abomasum
Describe the abomasal pathology with Cryptosporidium andersoni
Dilation of peptic/pyloric glands
Hypertrophy of gastric mucosa
Thinning of epithelium
Impaired protein digestion: increased gastric pH, decreased proteolysis
Describe Cryptosporidium bovis
Newly proposed species
Common in older calves
No clinical disease- not considered pathogenic
Describe Cryptosporidium canis
Usually in puppies Asymptomatic shedding in older dogs Rarely associated with disease Low prevalence Diarrhea, weight loss
Describe Cryptosporidium felis
Rarely associated with disease
Diarrhea, anorexia, weight loss
What are methods of diagnosis for Cryptosporidium?
Oocyst detection: Sugar flotation Modified acid fast Fluorescent antibody tests PCR
Describe Cryptosporidium oocyst morphology
4-6 μm
No sporocys
4 sporozoites, free in oocyst
Sporulates in host
What are methods of treatment for Cryptosporidium?
No efficacious treatments
Fluid and electrolyte replacement
Self-limiting in immune incompetent host
What are the methods of control for Cryptosporidium?
Management strategies to break life cycle
Clean up environment
What are the 3 forms of Cryptosporidium in avian hosts?
Intestinal
Respiratory
Renal
Describe intestinal Cryptosporidium signs
Enteritis non-bloody diarrhea Distended SI Mucoid intestinal contents Villous atrophy/hypertrophy Lesions in proventriculus
Describe respiratory Cryptosporidium signs
Rails coughing
Sneezing
Dyspnea
Swollen head syndrome
Describe renal Cryptosporidium signs
Kidneys pale
Enlarged, fibrotic areas