About a month ago, nursery told us that there had been cases of worms amongst the children. They told us what to look out for - white cotton-like threads and itching. This was around the same time that DS stopped needing nappies and, like lots of little boys, his hands are often to be found in his pants, front and back. Nice. 
Anyway, he's still pooing in a potty so I've been inspecting every poo and haven't seen anything slightly wormish, so I haven't dosed him.
Yesterday when I picked him up from nursery, they told me that he's been itching and I should get him checked out for worms. Again, I've been inspecting and haven't seen anything, and I haven't seen him itching his bum.
So, should I dose him (and us) anyway? I don't particularly want to give him medicine if he doesn't need it (is it horrible?), but I don't want to be that awful family that doesn't deal with their kids' parasites!
Advice please 