I've seen similar estimate, but the Black Death spread over 7 years in Europe (longer worldwide), while the Spanish flu lasted only 24 months with peak activity being much shorter.
http://upload.wikimedia.org/wikipedia/commons/thumb/e/e2/Spanish_flu_death_chart.png/787px-Spanish_flu_death_chart.png
Yes, it's the modern world!... in medieval times people spend years to travel from a country to other. now, we spend days (or hours)...
Faster travels, faster epidemics!
I don't think is possible, but it would be wonderful to have epidemics on BM!
ALWAYS the same boring Starvations and Droughts... BORED TO DEATH?
TRY the NEW EPIDEMICS!!! BUBONIC PLAGUES!, TYPHUS!, SPANISH FLU AND THE NEW AND IMPROVED: BLACK DEATH!!!
FUN for all the Family!!! Invite your friends and GET ALL THE FUN, ALL TOGETHER!!! THE MORE THE MERRIER!