Yes, worms (tapeworm, roundworm, and hookworms- all parasites) CAN be transmitted to humans by contact with an infected cart's feces.

You can catch Tapeworm from ingesting fleas. Not very common to contract tapeworm, but if you do, it will work its way through your excretory system and eliminated. Symptoms for tapeworm are very easy to miss- they include vomiting, dizziness, loss of appetite, weight loss, or hunger.

To catch Roundworm, you would have to ingest the eggs that dwell in feces (its called VLM, or visceral larval migrans). Be sure to always wash your hands when handling the cat and its litter box. Symptoms would be abdominal pain, loss of appetite, asthma symptoms, and eye pain.

Hookworms (a species of roundworm) is contracted the same way as roundworm. It will eventually die on its own but until then, it will cause a skin inflammation. Because the hookworm feeds off of blood, iron and protein deficiencies are common. Other symptoms are loss of appetite, abdominal discomfort, dry skin and hair, and a craving to eat dirt. In very rare cases, cardiac arrest may occur.

You can catch Tapeworm from ingesting fleas. Not very common to contract tapeworm, but if you do, it will work its way through your excretory system and eliminated. Signs of tapeworm include a "potbelly" caused by building fluids in the abdomen.

Then there's Ringworm- which is actually not a worm at all, but a fungal infection that can be contracted by coming into contact with an infected cat's skin or fur. You would develop ring-shaped lesions (hence the name).

Heartworms can also be passed on, but there is currently no effective cure for cats, so if your cat has been getting treatment, chances are that she is getting treated for one of the prior mentioned conditions.

To protect yourself and your son, be sure to always wear shoes when walking around the litterbox. Frequently wash your hands (especially after handling an infected cat), and keep small children from playing near the litter box. Be proactive with flea control.

There are many holistic treatments available- be sure to discuss options with your doctor.