Ascarid Infections Ascarids are worms. Eggs of T. canis are passed in the feces and larva develop to the infective stage within the egg. Eggs are extremely resistant to adverse conditions. Infection can occur from contact with dog feces, dirt, earthworms, mice, etc. Expulsion of the worm in infected cats can be through the feces or vomitus.
Rodent ingestion is a common mode of transmission to the cat.
Transmission to humans is usually by ingestion of infective eggs from soil contaminated with dog or cat feces or by directly handling of the feces. Dogs should be kept away from feces found on the street. Cats or dogs suspected of having worms should be treated by a veterinarian immediately and care should be taken to avoid direct contact with both feces and vomitus. Rough play and situations where scratches are a possibility should be avoided. Wounds should be washed promptly.