I have asthma too.  I'd recommend getting a pneumonia vaccine (Pneumovax 23) as a preventative measure.  Sadly, we're much more vulnerable to respiratory infections than other people.  Fair warning, make sure you have two days off to rest after getting the shot.  That one makes you miserable for a day or two. (Still better than getting sick.)  It's already saved me several times after being exposed to people with pneumonia.