Our cats spend their lives using the veg patch as a toilet. We just clear it up and carry on planting and eating, we are still alive and healthy. (ish!).
Shouldn't be any problem at all unless they have some dread disease.
Strewing twiggy sticks on the beds will keep them off - they like a cat-sized area free of obstructions. The pricklier the better, of course - gooseberry prunings are great!
My only concern would be if someone in the household is pregnant or likely to become so in the near future.
you beat me to it ps2
Something like this should be designed.
If you have any pyracantha prune it and spread the off cuts over the bed very effective cat deterrent.