Babesia and Theileria

Question 1

first pathogenic protozoan shown to be transmitted by an arthropod vector

Answer 1

Babesia bigemina

Question 2

Parasite of the RBC transmitted
by ticks

Answer 2

babesia

Question 3

2 merozoites appearance

Answer 3

pear-shaped

Question 4

tetrad merozoites appearance

Answer 4

cruciform

Question 5

Three species cause tick fever in cattle

Answer 5

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

Question 6

infect humans from rodents in N. america

Answer 6

B. microti

Question 7

infect humans from cattle in europe

Answer 7

B. divergens

Question 8

mode of transmission of babesia in biological vectors

Answer 8

transovarially

Question 9

Blood sucking flies that may serve as
mechanical vectors of babesia

Answer 9

Stomoxys and Tabanus

Question 10

Parasites cause extensive intravascular
haemolysis (erythrocyte rupture) producing progressive signs of anaemia

Answer 10

babesia

Question 11

red discolouration of the urine, ‘red water’ in bovine babesiosis is a result of?

Answer 11

Jaundice and haemoglobinuria

Question 12

This may occurs if RBC clumping and sludging occurs in the brain capillaries

Answer 12

Hyperexcitability and incoordination

Question 13

Other names of bovine babesiosis

Answer 13

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

Question 14

Why is there an inverse age resistance in babesiosis?

Answer 14

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

Question 15

Etiological agent for East Coast
fever of African cattle

Answer 15

theileria parva

Question 16

vector of theileriosis

Answer 16

Rhipicephalus appendiculatus or brown ear tick

Question 17

Theileria parva affects:

Answer 17

erythrocytes, lymphocytes, and endothelial cells

Question 18

Pathognomonic sign of theilara parva

Answer 18

leukopenia and thrombocytopenia with little anemia developing late

Question 19

cause tropical theileriosis in cattle

Answer 19

Theileria annulata

Question 20

causes malignant ovine/caprine theileriosis

Answer 20

Theileria hirci

Question 21

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

Answer 21

transtadially

Question 22

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

Answer 22

Cytauxzoon felis

Question 23

affects reticuloendothelial cells

Answer 23

Cytauxzoon felis

Question 24

reservoir hosts of Cytauxzoon felis

Answer 24

bobcats

Question 25

C. felis is transmitted by?

Answer 25

Dermacentor variabilis, transtadially