Exam 1: Species

Question 1

Cystoisospora spp

Answer 1

• Taxonomy: protozoan, apicomplexan, “coccida”
• Geo Dist: worldwide
• Location: small intestine,(cecum, colon)
• Life cycle: ingestion of sporulated oocysts, oocysts passed in feces.
• Clinical importance: young animlas, diarrhea, abdominal pain, anorexia. seen in stressed envioronements. can be seen in fecal float

Question 2

Giardia sp.

Answer 2

• Taxonomy: Protozoa (flagellate)
• Geo Dist: Worldwide
• Location: Small intestine
• Life Cycle: ingest cyst, to trophozoite, binary fission, encystment, passed into environment
• Clinical importance: chronic diarrhea. dog pass to dog, cat to cat, human to human. can be seen in fecal float

Question 3

Ancylostoma caninum

Answer 3

• Taxonomy: nematoda, “hookworm”. order strongyloid
• Geo Dist: worldwide, tropical and subtropical
• Location: small intestine
• Life cycle: percutaneous infection or ingestion of larvae. parasites that reach lungs cna move to skeltal muscle and pass through transmammary transmission.
• Clinical importance: acute or chronic anemia, diarrhea, can be seen in fecal float

Question 4

Toxocara and Toxascaris spp

Answer 4

• Taxonomy: nematoda
• Geo Dist: worldwide
• Location: small intestine
• Life cycle: unembryonated eggs passed in feces, peroral, prenatal/transplacental,
• Clinical importance: toxocara zoonitc, toxoscaris not.

Question 5

Trichuris spp.

Answer 5

• Taxonomy: Nematoda (“Whipworms”)
• Geo Dist: worldwide
• Location: large intestine
• Life cycle: unembryonated eggs passed in feces
• Clinical importance: anemia, diarrhea, weightloss

Question 6

Dipylidium caninum

Answer 6

• Taxonomy: cestoda “tapeworms”
• Geo Dist: worldwide
• Location: small intestine
• Life cycle: proglottids, flea ingestion, hexacanth embryo. arthropods contain a cysterceroid
• Clinical importance: zoonotic. asymptomatic

Question 7

Taenia spp.

Answer 7

• Taxonomy: cestoda “tapeworms”
• Geo Dist: Ubiquitous
• Location: small intestine
• Life cycle: proglottids shed and ingested by intermediate host, larval cysts develop, ingested my definitive host while scavenging. larval stage called metacestode.
• Clinical importance: zoonotic. for s species, low in cat and dog species

Question 8

Dioctophyma renale

Question 9

Dirofilaria immitis

Question 10

Hepatozoon americanum

Answer 10

• taxonomy: apicomplexan, prtozoan
• GI and nervous system
• tick, sporocyst, oocyts
• weightloss, anemia, lethargy