CME is only for high-profile outbreaks. It is impossible to assign an ID for EVERY virus, because there is nobody has/knows about every virus. In fact antivirus companies are reluctant to share more than a few virus samples with each other, let alone US Government (who runs CME program). And then like the poster above said, even if they had all been numbered, media will still call them "Sex and Rock'n'Roll virus on the loose".