Babesia and Theileria

Question 1

The first pathogenic protozoan shown to be transmitted by an arthropod vector

Answer 1

Babesia bigemina

Question 2

Babesia are parasites transmitted by ticks that primarily attack which type of cells?

Answer 2

RBCs

Question 3

What is the shape of a tetrad merozoites of Babesia spp?

Answer 3

Cruciform

Question 4

Identify the three Babesia species which primarily cause tick fever in cattle

Answer 4

B. bovis (B. argentina), B. bigemina, and B. divergens

Question 5

These Babesia spp has been reported to infect humans from rodents in N. america

Answer 5

B. microti

Question 6

These Babesia spp has been reported to infect humans from cattle in europe

Answer 6

B. divergens

Question 7

What is the mode of transmission of Babesia in biological vectors?

Answer 7

Transovarially

Question 8

Name two blood sucking flies that may serve as mechanical vectors of babesia

Answer 8

Stomoxys and Tabanus

Question 9

Babesia infection causes red discoloration of the urine called as?

Answer 9

Red water

Question 10

What are the three main culprits of Bovine Babesiosis?

Answer 10

B. bigemina
B. divergens
B. bovis

Question 11

Other names of bovine babesiosis

Answer 11

1. Red Water disease
2. Texas Fever
3. Tick-borne fever
4. Bovine piroplasmosis
5. Cattle babesiosis

Question 12

Why is there an inverse age resistance in babesiosis?

Answer 12

• Passive immunity within 3 mos. after birth
• Calves at 4 to 9 months have innate resistance to babesiosis

Question 13

Etiological agent for East Coast
fever of African cattle

Answer 13

Theileria parva

Question 14

What is the principal vector of theileriosis?

Answer 14

Rhipicephalus appendiculatus or brown ear tick

Question 15

Theileria parva mainly affects these three cell types

Answer 15

erythrocytes, lymphocytes, and endothelial cells

Question 16

Pathognomonic sign of theilara parva

Answer 16

Leukopenia and thrombocytopenia with little anemia developing late

Question 17

The cause of tropical theileriosis in cattle

Answer 17

Theileria annulata

Question 18

The cause of malignant ovine/caprine theileriosis

Answer 18

Theileria hirci

Question 19

T. annulata and T. hirci are transmitted by hyalomma through which mechanism

Answer 19

transtadially

Question 20

Sporadic but rapidly and uniformly fatal disease of domestic cats in the south central US

Answer 20

Cytauxzoon felis

Question 21

Cytauxzoon felis affects which cell types?

Answer 21

Reticuloendothelial cells

Question 22

Reservoir hosts of Cytauxzoon felis

Answer 22

bobcats

Question 23

Cytauxzoon felis is transmitted by?

Answer 23

Dermacentor variabilis - transtadially

Question 24

One of the most important bovine hemotropic diseases in the tropics and subtropics

Answer 24

“Maltese-cross” type Intraerythrocytic
Organism