In the UK, about 2-3% of people are believed to be infected with roundworm at some stage in their lives. However, most of these will remain unaware that they've been exposed to the parasite, as infection is often symptomless, or causes nothing worse than a stomach ache.
The risk of serious human harm as a result of a roundworm infection caught from a cat or dog is remote, and must be weighed against the very considerable benefits of owning a pet.
Nevertheless, 12 people annually in the UK suffer eye damage as a result of a roundworm infection: caused when the eggs develop into larvae and circulate to the back of the eye.
So, whilst the risk may be small, the consequences can be severe. Linda Hughes is a veterinary practice manager whose daughter suffered an infection. You can read her story by clicking the link below.
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