Exam 1 Flashcards
Type I Ostertagia ostertagi Season? Age affected? Emergence? When do they emerge?
Summer
Calves
slow emergence
emerge during 1st grazing period
Type II Ostertagia ostertagi Season? Age affected? Emergence? When do they emerge?
Winter
Yearlings
Synchronized emergence
emerge after 1st grazing period
You go to a farm where you see cows displaying clinical signs of diarrhea, bottle jaw, and weight loss. It is February and the cows affected were born the year before. You perform a McMaster and find strongylid type eggs. You perform a necropsy and find Moroccan leather in the abomasum. What parasite are you dealing with?
Type II ostertagia ostertagi
You go to a farm where you see sheep and goats that show clinical signs of intermittent diarrhea and weight loss. You perform a McMaster where you find strongylid type eggs. What parasite are you likely dealing with and what part of the stomach does it affect?
Teladorsagia circumcincta; affects gastric glands of the stomach
Which two parasites are associated with poor sow syndrome?
Hyostrongylus rubidis and oesophagostomum
What age group are you concerned about becoming infected with toxocara (roundworms) and why?
young (puppies and kittens); the adults are large and can cause obstruction in the small intestine
Your patients are a litter of 3 week old puppies and their mother. The puppies present with pot bellies, diarrhea, vomiting, and a cough. The mom presents with vomiting and diarrhea which started before she got pregnant with the puppies. You perform a fecal flotation and find eggs with a thick shell and dark morula. What parasite are you dealing with and what would you suggest the owner do to prevent reinfection?
Toxocara canis; owner should pick up feces
Which of the following roundworms are zoonotic and which is the most zoonotic?
a. Toxocara canis
b. Toxocara cati
c. Toxocaris leonina
d. Parascaris equorum
e. Ascaris suum
f. Baylisascari procyonis
a. Toxocara canis
b. Toxocara cati
c. Ascaris suum
d. Baylisascari procyonis (MOST ZOONOTIC)
Which species of parasite has an infective L2 or L3 stage and can be seen within the egg?
Toxocari
What is the common name for strongyloides?
Threadworms
Which parasite is best described: can live free in the environment L3 stage can live in somatic tissues adult lives in the SI but can migrate to the heart and lungs 1/3 of body is esophagus VERY SHORT PPP Clinical signs include uticaria
Strongyloides (threadworms)
Your patient is a foal displaying frenzy, diarrhea, and enteritis. You perform a Baermann and find L1 in eggs. What parasite do you suspect?
Strongyloides westeri
Which of the following strongyloides is zoonotic?
a. S. stercoralis
b. S. papillosus
c. S. ransomi
d. S. westeri
S. stercoralis
Which lungworms’s L1 has a kinked tail?
Metastrongyloidea
Which lungworms’s L1 has a straight tail?
Dictyocaulus
Which group of parasites is the only one with an INDIRECT life cycle that we have learned about?
Metastrongyloidea
Your P is a 14 year old cat who presents with a cough, bronchitis and pneumonia. What parasite could be causing this?
Aelurostrongylus abstrusus
You perform a necropsy on a sheep that appears to have “leadshot” in the lungs (lesions). Which parasite is causing this?
Muellerius spp. (Metastrongyloidea)
Your patient is a horse that presents with neurological signs. The horse is given time to roam freely about the property where wildlife can often be seen. What parasite would you expect?
Paralephostrongylus tenius; the horse (and cows) are the abberant hosts
Which is the only metastrongyloidea witha direct life cycle? How is it transmitted?
Filaroides osleri; transmitted by mom dog licking her puppies
What parasite affects both goats and sheep but is more pathogenic in goats?
Dictyocaulus filarial
What parasite infects both horses and donkeys but is only pathogenic in donkeys?
Dictyocaulus arnfieldi
What condition can be caused by treating dictyocaulus?
Prepatent parasitic bronchitis
Which species of Dictyocaulus affects young cattle?
Dictyocaulus vinparous
This parasite is the number one killer of sheep and goats due to it’s resistance. It can be diagnosed with a McMaster and Famacha.
Haemonchus contortus
Your patient is a cow that presents with mild clinical signs including anemia, bottle jaw, and gastritis. What parasite could this be?
Haemonchus placei
In which stage and where does haemonchus arrest?
L4 in the abomasum
You perform a necropsy on an older pig after suffering from anemia, diarrhea, weight loss ad green feces. There are other pigs as well as ruminants on the farm that seem to be affected. During the necropsy, you find nodules inside the large intestine. Which parasite could this be and what causes these nodules?
Oesophagostomum; arrested L4 causes nodules
A horse and cow present with severe diarrhea after exhibiting signs of stress with being moved to a new barn. Which parasite could this be?
Trichostrongylus
You arrive at a farm where a farmer notes he has had several lambs die. The lamb’s back ends are covered in diarrhea and they have increased thirst and appear dehydrated. When you perform a McMaster, you find large eggs that appear to have “bubbles” inside and contain an L3. Which parasite is this and what is it’s common name?
Nematodireus battus; Longneck Bankrupt Worm
Which two parasites are often associated with clinical signs developing after stress?
Cooperia spp. and Trichostrongylus
Which ancylostoma is most pathogenic and why?
Ancylostoma caninum; parasites have 3 pairs of teeth
A bird presents with respiratory distress after eating an earthworm. The egg has one operculum on each side when you perform a fecal float. What parasite is this?
Syngamus trachea (gapeworm)
You perform a necropsy on a bird that was presenting with respiratory distress before its death. You find red y-shaped parasites in the trachea. What parasite is this?
Syngamus trachea (gapeworm)
Your patient is a young bird that presents with anorexia and diarrhea and is obstructed with parasites in the small intestine. The egg is a rounded rectangular shape with a thick shell. What parasite is this?
Ascaridia spp
What parasite known as the “Poultry Cecal Worm” affects chickens and turkeys, transmits histomonas to turkeys known as black heads and has an infective stage of L2-L3?
Heterakis galinarum
