Unwanted Visitor

We've got an unwanted and uninvited visitor; a mouse. I went to get the cereal out of the cupboard this morning to discover one of the cornflakes bags have been split open and one of the boxes of weetabix have been chewed through. We've disposed of anything that even had the slightest chance of contamination and spent the rest of the day going through all the cupboards in the kitchen, emptying them, disinfecting them and ensuring that any possible route of ingress has been blocked. We've also moved any boxes or bags of foodstuffs at risk out of the bottom cupboards and put them up into the higher cupboards, We haven't put any poison or traps down but we may yet end up doing so.