The infection can then spread from person to person through infected feces. Roundworms can live inside the small intestine for up to 2 years. The worms are about as thick as a pencil. They can grow to be about 13 inches long.
Can roundworms get big?
Dogs get two main roundworm species: Toxocara canis and Toxascaris leonina. Toxocara canis is worse, and people can get it, too. They're usually white or light brown and can be up to a few inches long. (They look like spaghetti.)
What do large roundworms look like?
You may notice the adult roundworms in your dog's feces or vomit. They will appear white or light brown in color and may be several inches long.
Can you see roundworms in human feces?
It often lives in human feces (poop). People catch it through hand-to-mouth contact. If you have a roundworm infection of your intestines (ascariasis), you may not have symptoms. You may see live worms in your poop though.
What happens if roundworms go untreated in humans?
Most cases of ascariasis are mild and don't cause major problems. However, heavy infestations can spread to other parts of the body and lead to dangerous complications, including: Intestinal blockage. Intestinal blockage occurs when a mass of worms blocks your intestines, causing severe pain and vomiting.
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