MILLION TIMES EVOLUTION. “Viruses are arguably the fastest-evolving biological entity on this planet. Many of them evolve at a rate in the order of 10(−3) substitutions per site per year (s/n/y). This is approximately a million times faster than the rates of evolution of cellular host organisms, typically around 10(−9) s/n/y.” No mean achievement.
http://www.sciencedirect.com/science/article/pii/S0042682215000549