I tend to stay away from negative sounding or appearing domian names.
But that is just me.
Staph is relatively new(er) in the news to most laypeople not in the medical profession. This is something we deal with every day.
I would be more concerned with Serratia Marcescens, ebola, junta virus, necrotizing fasciitis and others.
Now, what does all that mean?
It means staph is in the news now, soon to be replaced by something else, staph is no eColi (which is some nasty shit...literally), and no one is going to look up staph on the cellular phone nor are they going to look up Serratia Marcescens, ebola, junta virus, or necrotizing fasciitis. There are PDA's that have medical dictionary cards and treatment plans and perhaps some mobile web sites in the plans.
But most people are going to look up WebMD.com. Just because the word is available in .mobi, .cn, .in, .com.es, or anything else does not make it a good reg.
That's my two cents and opinion from the sigmoid colon.