Unfortunately, I'm afraid there's a little more than just a correlation. Advair contains a corticosteriod, which can supress the immune system, therefore putting us at risk for opportunistic infection. Fortunately, the risk is not that much higher, so I'm not worried about it.
<b>Edit:</b> Sorry, I did not see at first you already have pneumonia. Since fluticasone propionate affects the immune system, your pnemonia may be more difficult to get rid of than normal. I don't know if it would make that much of a difference, but perhaps you might ask your doctor if you can't switch to just serevent for a while until your infection clears up.