wish I had thought of this during kitten season last year. Unfortunately this photo doesn't link to the article and not in English - but a great idea if I could find instructions to DIY...will research it.
Feline Leukemia and FIV are both horrible life threatening diseases. Know your facts and keep your cat safe by keeping them away from infected cats. Allowing them to venture outdoors is a huge hazard as your cat may come contact with an infected cat and contract these diseases. Also please do your homework when adopting or purchasing a cat or kitten. Make sure they have been tested for these diseases.