Parasites

Question 1

ascarids

Answer 1

• live in the small intestine
• roundworms

Question 2

Oxyurids

Answer 2

• pinworms
• live in large intestine
• females are larger than males
• ova is flattened on one side

Question 3

Trichocephalids

Answer 3

• whipworms
• live in cecum or colon
• football shaped; 2 polar plugs; brown; smooth shell
• potentially ZOONOTIC
• Have a stichosome (part of the esophagus)
• does not have eggs/larvae in the feces of the host
• L1 (larvae) in the muscle of diagnostic stage

Question 4

capillaria

Answer 4

• Ova are similar to Trichuris but have parallel sides
• bipolar plugs; rough surface of shell

Question 5

strongyle-type eggs

Answer 5

Difficult to distinguish genera; thin shelled; blastomeres present (# vary); develop into larvae within eggs in the environment

Question 6

cestodes

Answer 6

tapeworms

Question 7

fasciola

Answer 7

• Trematodes (flukes); flat worms
• Large eggs that don’t float well; brown pigmented contents; operculum at one pole

Question 8

coccidia

Answer 8

• Oocyst (not ova, or egg) is passed in the feces.
• Only shed by the definitive host