ascarids (roundworms)

Question 1

roundworm morphology

Answer 1

large worms (up to 60 cm)
females larger
occupy small intestine
feed of host ingesta
development to infective stage outside of host

Question 2

toxocara canis

Answer 2

canine roundworm
large worms, females always larger
males smaller w coiled tail
mouth w 3 lips

Question 3

toxocara canis direct lifecycle

Answer 3

eggs passed in feces
develop to infective stage 2-3 weeks
larvated eggs ingested
hatch and enter blood supply, tracheal migration
adults pass eggs 4-5 weeks post infection

Question 4

toxocara canis vertical transmission

Answer 4

mother to offspring
mature worms passing thousands of eggs in puppies by 3 weeks
mothers infected w sequestered larvae infect for 365 days

Question 5

toxocara canis indirect lifecycle

Answer 5

ingestion of infected larvae in paratenic host
prey infected by ingesting eggs
larvae hatch

Question 6

toxocara canis pathogenesis

Answer 6

hyperinfection in immune naive
mechanical damage from migration through alveoli leading to pneumonia
irritation in gut as worms mature, pot belly appearence!

Question 7

toxocara canis diagnosis

Answer 7

worms in feces/vomit
unthrifty appearance
hair coat w dried vomit/diarrhea
pot bellied appearance
OLDER DOGS-> dull hair poor BCS

Question 8

toxocara canis egg appearence

Answer 8

round, pitted shell w stikcy coat
dark dingle cell embryo

Question 9

toxocara canis treatment/ prevention

Answer 9

deworm at 2,4,6,8 weeks
Pyrantel!!!

Question 10

toxocara cati morphology

Answer 10

feline roundworm
similar size to canine
adult worms w prominent cevial alae (arrow like projection)

Question 11

toxocara cati direct lifecycle

Answer 11

ingestion of larvated eggs
eggs hatch and migrate to hepatic blood
tracheal migration
eggs passed in feces 42-49 days post

Question 12

toxocara cati facultative indirect lifecycle

Answer 12

cats infected by ingesting paratenic host
larvae in paratenic host activated and go to S.I
*** THIS IS MORE LIKELY

Question 13

toxocara cati vertical transmission

Answer 13

NONE, gotcha bitch

Question 14

toxocara cati clinical signs

Answer 14

coughing, gagging
worms in feces/vomit

Question 15

toxocara cati egg appearance

Answer 15

round, pitted shell w sticky coat
dark, single cell embryo

Question 16

toxocara cati treatment/prevention

Answer 16

PYRANTEL

Question 17

toxocara leonia direct life cycle

Answer 17

Dog and cat are host
ingestion of larvated eggs
ingestion of paratenic host
NO TRACHEAL MIGRATION
NO VERTICAL TRASNMISSION

Question 18

toxocara leonia egg appearance

Answer 18

round to slightly oval
smooth shell, LACKING COAT
light, translucent single cell embryo

Question 19

baylisascaris procyonis morphology

Answer 19

large stout worms, females larger
size of worm is larger but eggs smaller

Question 20

baylisascaris procyonis direct lifecycle

Answer 20

ingestion of larvated eggs
contaminated fur from contact w dens

Question 21

baylisascaris procyonis facultative indirect

Answer 21

ingestion of paratenic host

Question 22

baylisascaris procyonis egg appearence

Answer 22

sub spherical to round, thick albuminous shell, finely pitted surface
golden brown
dark single cell embryo