Squirmin' Wormin'!
Hi Ruppard!
It's not uncommon for puppies to shed live worms, even after they are given medication. Most parasites such as worms go through several different life stages while they are in the environment and in the host animal. The medications are only effective in getting rid of one or a couple of life stages, therefore, only some of the parasites are killed in one treatment. The rest go on to mature and the puppy will need to be treated again. Another possibility is that the environment is contaminated and the puppy is being reinfected by contact with eggs or larvae. What type of worms are coming out and how (in stool or vomit)? Are the worms white and spaghetti like or are they small and like tiny grains of rice. The rice like worms are actually only segments of a larger worm (tapeworm) and these require a specialized medication to get rid of them. The good news is that people cannot catch these kind of worms. The spaghetti worms are roundworms and, as you wondered in your question, roundworms are zoonotic (can be transferred to humans). Humans will not get adult worms (phew!) but if the eggs are eaten by accident (these come out in stool) the larvae that develop inside the human body may travel around through tissues and can cause some problems. This is called "visceral larval migrans". As always, using proper hygiene after handling pet stool and cleaning up stool in the yard and accidents in the house promptly will prevent infection. Youngsters are more prone to infection since they tend to be a little more careless with hygiene and putting things in their mouths. Take care (as always) to supervise contact between children and pets and mind that children wash hands and are not in contact with the puppy's stool or anal region. Also, make sure your puppy is not eating his/her own stool as this will cause reinfection.
As an aside, ringworm is not a worm at all but actually a fungus. It is found in the soil and it is not uncommon for children and baby animals to pick it up. It can also be transferred from host to host by contact with the ring shaped lesion it causes on the skin.
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