The nature of viruses are understood a little more each passing day. But they remain mysterious, and often a new one will appear with the ability to shock and horrify with some novel method of inflicting death or mutilation. In the case of hyperpilosity, a highly contagious flu virus has a physically harmless, yet psychologically devastating side effect. In fact, it reverses a trait brought about by a primordial virus in the distant past. And it itches...