What are the two life stages of the feline roundworm that can infect humans?

The correct answer identifies that both the eggs and larvae of the feline roundworm can infect humans.

In the life cycle of the feline roundworm, the eggs are shed in the feces of infected cats and can contaminate the environment. When humans, especially children, accidentally ingest these eggs, they can develop into larvae within the human body. The larvae can then migrate to various tissues, potentially leading to a condition known as toxocariasis. This underscores the importance of hygiene and prevention, especially in households with cats.

Although adult worms are primarily found in the intestines of cats and can produce eggs, they do not infect humans directly. Larvae can migrate and cause health issues, but it is the eggs present in the environment that lead to the initial infection in humans. Thus, eggs and larvae are the stages relevant to infection in humans.