Superfamily Ascaridoidea

Question 1

Toxocara canis = host, PPP, infection

Answer 1

dogs and foxes, PPP = 16d-3 weeks, infection = transplacental, transmammary, oral, paratenic host

Question 2

Toxocara cati = host, PPP, infection

Answer 2

host = cats, PPP = ~8 weeks, infection = transmammary, oral [NO transplacental]

Question 3

Toxoscaris leonine = host, PPP, infection

Answer 3

host = cats and dogs, PPP = ~11 weeks, infection = paratenic host

Question 4

Toxocara vitulorum = host, PPP, infection

Answer 4

host = exotic cattle, buffalo, PPP = 3-4 weeks, infection = transmammary

Question 5

Toxocara canis treatment

Answer 5

Start treatment before 16 days, treat bitch at same time

Fenbendazole (3 wks prepartum, 2 days post partum)

Question 6

Toxocara canis egg

Answer 6

embryonates at ~4 wks
Resistant!, sticky, temp determinate
Pitted egg shell
very similar to T. catis egg

Question 7

Toxocara canis hepatotracheal migration

Answer 7

liver -> lungs -> coughed to lungs

Question 8

T. canis transplacental reactivation

Answer 8

L3 reactivation in 3 weeks -> prepartum -> fetal lung -> L3 to SI via trachea

Question 9

T. canis transmammary

Answer 9

L3 in milk for ~5 weeks -> right to SI

Question 10

T. canis clinical signs (migratory)

Answer 10

coughing, increase RR, pneumonia in heavy infections

Question 11

T. canis clinical signs (enteral)

Answer 11

pot belly pup, ill-thrift

Question 12

T. canis in man causes

Answer 12

visceral larval migrans, occular larva migrans

Question 13

T. canis diagnosis in humans

Answer 13

Ab detection against larval ES antigens

Question 14

T. catis egg and adult

Answer 14

very similar to T. canis (pitted shell, round)
direct route to SI
adult = arrowhead appearance

Question 15

T. leonine egg and adult

Answer 15

smooth shell, L3 egg, & adult = pointed head

Question 16

T. vitulorum egg and adult

Answer 16

egg = pitted shell, but thinner
adult = ~30cm