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It will help if you could provide some further information.
MSSA refers to methicillin sensitive Staph aureus, which is a common form of Staph that is frequently on the skin of humans, so usually does not indicate any other exposure.
Were any other germs grown on cultures?
Was the doctor able to culture the same germ from an infected wound on the foot as was grown from the pneumonia?
I had asked for some further information and have not heard back.
The information that you have provided does not raise any suspicion about an infection from a dog. MSSA is a common germ to cause a variety of infections, including pneumonia, and it does not indicate any exposure to a dog. The most common risk factor for a pneumonia from MSSA is as a secondary infection following certain viral infections, including the flu.
It is possible that there is other clinical information that would raise suspicion about a dog exposure, but that is why I asked for additional information.
As for the risk to you, there is no reason for you to be concerned about being exposed to him when he returns home. The risk of transmission of pneumonia is already relatively low, because there are many defense mechanisms to prevent transmission. And in addition, by the time that he is able to return home, the antibiotics would already have gotten a good amount of control over the germs growing in his infection, so even the low risk is further diminished.
If I can provide any further information, please let me know.