Thanks everyone and thanks for the link, Craftlady. It really looks like these things are handled totally differently in my country. I will bring this to my vet's attention the next time I see her. I suppose the reason why we give worm treatments here is that they are cheaper than doing the test.

Debbie, from what I've read, indoor cat get infected from eggs that you've carried with you on your shoes (they can survive in soil for a long time) and from feeding raw meat.

Kirsten