The phrase "infective eggs" refers to eggs that are capable of causing an infection. These eggs may contain harmful organisms or pathogens that can cause diseases when they enter our bodies. Full definition
Dogs can become infected either by ingesting infective eggs in the same way as roundworms through the environment or the tiny larvae can burrow into the skin. (dogsbarn.com)
If you have read this far, you already know that most of these parasites enter your pet through its mouth from infective eggs, cysts or larva that have exited in the stool of another infected pet. (2ndchance.info)
Infected animals shed infective eggs in their feces that are ingested by routine sniffing behavior, direct ingestion of feces, or the sharing of a litter box. (web-dvm.net)