LAB 4 DEMO
Answer to Quiz Question
A. Given that the puppy was from Philadelphia:
Left egg is Ancylostoma caninum
Right egg is Toxocara canis
B. Toxocara canis entered the puppy in utero. The larvae crossed the placenta and arrested in the liver of the fetus. After the pup was born the larvae resumed their migration from the liver, through the heart to the lungs where they broke out of the capillaries and into the alveoli, causing the symptoms of pneumonia.
Ancylostoma caninum would have entered this young pup through the milk (transmammary). Orally ingested hookworm larvae do not undergo a somatic migration.
So, the answer to "B" is Toxocara canis.