CONFIRMED: Guinea Pig Disease in new Stuff Pack!!

@SimGuruGraham: when reading your answer to @Dannydanbo I think his thought is right or I don't understand your explanation.
For example: I have a family with a child, a teen and mom and dad and the teen catches the Rodent Fever. Mom and dad catch the Rodent Fever from the teen and (when no cure is taken) they will all die. :o Then the child becomes an orphan! Or not? ;)