Q. My cat has "guardia" - spelled wrong - but what is it? How contagious? What cures?
A. Giardiosis is caused by protozoan called Giardia. This is a small organism, let's say something between worm, bacteria and virus. It causes diarrhoea and vomiting in dogs and cats and it can be passed on to human, so you should be very careful when dealing with your cat (wash your hands after playing with your cat, don't allow children near your cat, change litter as soon as you cat used it etc). It spreads by contact with stools of infected cats.
Fortunately, this infection usually respond well to antibiotics treatment.