What are my legal actions towards the cattery regarding the purchase of an infected kitten?

Question Details: I bought a kitten from a cattery. It turned out to be that he was infected with a fungus. I noticed that on my skin and on a kitten started to appear red spots 3 weeks after we bought the kitten. Then I visited a vet and he diagnosed him with a fungal infection. Now everyone at home is infected too. The kitten didn't have any signs of infection when we were buying him, while another kitten in the cattery had bald patches on his ears. When we asked the owner why, she explained that it's because they were playing with each other. What are my legal actions towards the cattery?

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