Lecture 18: Piroplasmosis and Haemosporidosis Flashcards
What type of parasites are piroplasmids
Obligate intracellular parasites
What life cycles do piroplasmids have
Indirect
What is the definitive host/vector for piroplasmids
Ticks
What is the intermediate host for piroplasmids
Mammals, birds
What life cycle stages take place on the tick
Gametogeny, fertilization and sporogeny
Where do Sporozoites develop and tick and how are they transmitted to host
Develop in tick salivary glands and are injected into vertebrate host
What life cycle stage takes place on the vertebrate intermediate host for piroplasmids
Schizogeny
Where does multiplication occur for babesia
RBCs
Where does multiplication occur for theileria and cytauxzoon
Exoerythrocytic multiplication in leukocytes followed by multiplication in RBC’s
What are piroplasmids
Intraerythrocytic stages
T or F: transovarial transmission can occur with Babesia
Trueo
Describe the erythrocytic cycle (babesia)
- Sporozoites infect RBC
- Piroplasmids divide within RBCs
- Merozoites form, lyse RBC and go infect new RBC
What are the two species of canine babesiosis
B. Canis and B. Gibsoni
What is the main vector for B. Canis
Rhipicephalus sangineus
How is B. Gibsoni transmitted
Via infected blood (dogfights)
What are some symptoms for canine babesiosis
Hemolytic anemia, thrombocytopenia, icterus, hemoglobinuria, splenomegaly, lymphadenopathy, can be fatal
Order the pathogenicity of species of canine babesia
B. Conradae»B. Gibsoni>.B. Canis
T or F: recovered animals, treated or untreated can still be carriers of canine babesia
True
What are the two species of bovine babesiosis
B. Bigemina and B. Bovis
What is the vector for B. Bigemina and B. Bovis
Rhipicephalus
Which species of bovine babesiosis is more pathogenic
b. Bovis
T or F: cows are still carriers of babesiosis regardless of treatment
True
What is the best way to identify and diagnose babesia
ID of piroplasms in blood smears
(Parasitemia often low in chronic babesiosis or asymptomatic)
What mammals are mainly parasitized by Theileria
Ruminants
T or F: transovarial transmission occurs with Theileria
False
Describe the exoerythrocytic phase
- Sporozoites infect WBC
- Schizonts divide within WBCs
- Merozoites form, lyse WBC and are released to infect RBC and develop into piroplasms