Nematodes- Superfamily Ancylostomatoidea

Question 1

Order Strongylida

Answer 1

includes: Ancylostomatoidea, Strongyloidea, Trichostrongyloidea
- life cycle: direct, infection by L3
- males have bursa
- arrested development
- eggs: thin shelled, oval, avg size, morula (not larvae)
- dx: float eggs

Question 2

Superfamily Ancylostomatoidea

Answer 2

• hookworms
• direct, L3 infective stage (potential migration to the lungs-pneumonia)
• PPP: 2-3 wks
• arrested development- larval leakage
• eggs: thin shell, oval, avg size, CANT tell between spp.
• adults: small intestine
• bursa, teeth/cutting plates & lg buccal capsule
• CS: hemorrhaging, anemia, ulcers, d+, coughing if lung migration, dermatitis
• zoonotic
• Dx: fecal float

Question 3

Ancylostoma caninum

Answer 3

-southern hookworm
-Host: dogs
-PPP: 2-3 weeks –> younger pups more susceptible
-transmission: TM most common, per os, percutaneous, paratenic, TP
Site of infection: small intestine
MOST PATHOGENIC from L5 stage causing hemorrhage
-limited immunity, can’t avoid infection w/o tx
-CS: anemia(messy eaters), d+, dermatitis, cough, pneumonia (larval migration in lungs), pale mm
** will see CS but no eggs in puppies younger than 2 wks
-Dx: fecal float (centrifuge) for eggs= most sensitive test, antigen test (find immature adults), necropsy= adults with hook
-Tx: NEVER wait for fecal results, tx ASAP if suspected
-zoonotic

Question 4

Ancylostoma tubaeformae

Answer 4

Host: cats 
Transmission: per os, percutaneous, PH, NO TM or TP (not in kittens)
-less pathogenic and less severe 
-zoonotic (but less frequent)
cats like tubes**

Question 5

Ancylostoma braziliense

Answer 5

Host: cats and dogs
Transmission: per os, percut, PH
-less pathogenic, less of a blood sucker (not a messy eater so doesn’t cause anemia)
-cutaneous larval migrans in humans- brazil walking on the sand
-***most zoonotic!!

Question 6

Uncinaria stenocephala

Answer 6

-northern hookworm
Host: cats and dogs
Transmission: per os, percut, PH
-not usually pathogenic (less of a blood sucker)
-zoonotic but rare
-can cause interdigital dermatits–> when you’re up north you rub your fingers together to get warm

Question 7

Bunostomum spp.

Answer 7

Host: ruminants (esp. young*)
CS: bottle jaw, d+, can get some anemia but not a concern due to size
Transmission: per os, percut

Question 8

Zoonotic spp.

Answer 8

A. caninum
A. tubaeforme
A. braziliense
Uncinaria stenocephala