My boyfriend has a rat or mouse living in his house; what are the diseases he can catch from it? Can I get sick from kissing him if he’s ill now?

Caution please. Many diseases can be spread this way such as Hantavirus Pulmonary Syndrome, Hemorrhagic Fever with Renal Syndrome, and Lassa Fever. Direct person to person spread of these diseases is possible. Please advise your boyfriend to get a professional exterminator help him get rid of the rodent. And I suggest you both have general medical exams at a clinic. I wish you well with your health!