Are wild mice dangerous

yes they can, but it is highly unlikely that any disease carried by a live mouse will be passed on to a human directly. However, their urine and faeces can cause illness if it has contact with food and/or food preparation surfaces, hence any restaurant found to have an infestation may be shut down.

Wild mice should not be put in contact with tame pet mice, as diseases can be spread easily between them. Wild mice will also very likely carry fleas and mites which can infest other pets.

A dead mouse, however, may have other nasties living on it, and should not be touched, but disposed of safely and quickly.