An ill looking and sounding Brian Littrell posted a YouTube message apologizing for missing the NYC Pinktober Hard Rock Cafe signing with fans. Brian Littrell has been diagnosed with the swine flu. The rest of the Backstreet Boys are taking Tamiflu in the hopes it will help them avoid the swine flu, but it probably won't help keep them from catching it. Swine flu is currently ripping through the U.S. population so lots of people will soon get to experience what Brian Littrell is going through.