Lecture 3: Nematodes (part 2)

Question 1

eyeworm

Answer 1

thelazia californensis

Question 2

where is thelazia californensis found

Answer 2

conjunctiva and tear ducts (dogs, cats, sheep, deer, humans)

Question 3

L1 of thelazia are ingested by what host

Answer 3

face fly, they molt into L3 (infective) in fly

Question 4

tx thelazia

Answer 4

remove parasites from eye
ivermectin
difficult to control face fly (musca)

Question 5

giant kindey worm

Answer 5

dioctophyme renale

Question 6

DH for dioctophyme renale

Answer 6

right kidney
main DH is MINK
dogs, wolves, foxes…rarely cats, humans, pigs, cattle

Question 7

IH for dioctophyme renale

Answer 7

annelid, lives on surface of crayfish

possible paratenic hosts include fish and frogs

Question 8

urinary bladder worm

Answer 8

pearsonema

p. plica (dogs)
p. feliscati (cats)

genus formerly known as Capillaria

Question 9

paratenic host of pearsonema

Answer 9

earthworms

Question 10

pearsonema egg

Answer 10

biopolar plugs; similar looking to tricharis (whips) and eucoleus (lungworms)

Question 11

infective stage of pearsonema

Answer 11

L1 encysted in earthworm

Question 12

eucoleus lungworms

Answer 12

eucoleus

e. aerophilus (dogs, cats)
e. boehmi (dogs)

Question 13

where in the host are eucoleus lungworms found

Answer 13

eucoleus aerophilus is found in the RESIPRATORY TRACT

E. boehmi is found in NASAL CAVITY (more common in hunting dogs)

Question 14

eucoleus life cycle

Answer 14

direct

Question 15

difference between the eggs of eucoleus aerophilus vs. e. boehmi

Answer 15

aerophilus is netted
boehmi is pitted
when focusing in and out

Question 16

infective stage of eucoleus

Answer 16

egg with L2 larvae

Question 17

usually asymptomatic, but with severe infections with eucoleus CS include

Answer 17

coughing!

bronchitis, pneumonia, dypsnea, etc.

Question 18

dx eucoleus

Answer 18

fecal exam or BAL

Question 19

How are the similar looking eggs of trichuris (whips) vs. pearsonema (UB worm) vs. eucoleus (lungworm) differentiated on fecal

Answer 19

trichuris (whips) : largest, very dark brown, smooth shell, symmetrical and prominent plugs, polar rings

Question 20

filaroides lungworms

Answer 20

filaroides

f. hirthi
f. osleri

Question 21

where is filaroides hirthi located

Answer 21

lung parenchyma

Question 22

where is filaroides osleri located

Answer 22

bifrucation OF TRACHEA

Question 23

L1 has a kinky tail and LACKS a dorsal spine. Which similar larvae has a dorsal spine

Answer 23

filaroides lungworm

aelurostrongylus (feline lungworm)

Question 24

tracheal nodules

Answer 24

filaroides osleri

Question 25

often misdiagnosed as kennel cough

Answer 25

filaroides

Question 26

feline lungworm

Answer 26

aelurostrongyllus abstrusus

Question 27

IH of aelurostrongyllus abstrusus

Answer 27

terrestrial snails and slugs

paratenic hosts: rodents, birds, amphibians, reptiles

Question 28

L1 have kinky tail with dorsal spine

Answer 28

aelurostongylus abstrusus

Question 29

rat lungworm

Answer 29

angiostrongylus cantonensis

Question 30

hosts for angiostrongylus (rat lungworm)

Answer 30

DH: rats in heart/pulm arteries

IH: snails/slugs

incidental hosts: humans, primates, other

paratenic hosts crustaceans and amphibians

Question 31

eosinophylic pleocytosis in CSF, bilateral HL and tail paresis, eospinophilia, otherneurological signs

Answer 31

canine neural angiostrongylosis (from rate lung worm)

Question 32

dx angiostrongylosis

Answer 32

CSF ELISA, hard to pick up

Question 33

guinea worm of dogs or serpent on the stick

Answer 33

dracunculus insignis

found in subcutaneous tissues of dogs, cats, and wildlife

Question 34

how does a pet get dracunculus insignis

Answer 34

ingesting L3 infected copepod (IH) or frog (PH)

female will make a blister in SC skin, burst with water contact to release L1