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They can't spontaneously get the disease no. They need to come in contact with a carrier.

Thank you, you reassured me. I hope I'm not a carrier:-)

I am sure if you have an inside kitty, that its a healthy and happy little furball :D

Whether or not you are a carrier, who knows. If you already are, its better than if you were to be with child and catch it. So maybe its better to already be a carrier.