Parasitic worms cannot reproduce entirely within their host's body they have a life cycle that includes some stages that need to take place outside of the host. This can cause weakness and disease in the host, and poses a global health and economic problem. They receive nourishment and protection while disrupting their hosts' ability to absorb nutrients. Parasitic worms live in and feed in living hosts. Some parasitic worms, including leeches and monogeneans, are ectoparasites – thus, they are not classified as helminths, which are endoparasites. Other parasitic worms such as schistosomes reside in blood vessels. Many are intestinal worms that are soil-transmitted and infect the gastrointestinal tract. Parasitic worms, also known as helminths, are large macroparasites adults can generally be seen with the naked eye. Eggs of different species of parasitic worm. For other uses, see Parasitic worm (disambiguation). For the infection caused by this organism, see Helminthiasis. Roundworm infections are extremely common, and it is safe to assume that all kittens will be infected.This article is about the organism. This process causes no harm to the queen, but means that kittens are very commonly infected with roundworms from a very young age. From earlier infections with roundworms, a queen will have some larvae remaining dormant in certain tissues in the body and when she gives birth to a litter of kittens these larvae migrate to the mammary glands and are excreted in the milk.
For Toxocara cati there is another important route of transmission to kittens, which is through the milk of the queen (mother). In addition, the eggs may be eaten by another animal (‘intermediate host’) such as a small rodent (for example a mouse or rat), and a cat can be infected by preying on (eating) the infected intermediate host. With both of these worms, eggs passed in the faeces can be ingested (eaten) by another cat leading to transmission of infection.
The two most common species found are Toxocara cati and Toxascaris leonina. Roundworms are very common, particularly in young cats and kittens.
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