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John2290 said:

It won't infect everyone but if it ifected, it'd be more along the lines of the Flu but if even that its 300k dead before the summer and as so many flu cases go unreported the figure could easily double. The high end is about one million in modern times but if this was say, 1920, it's be twenty times that, but who knows, maybe with a cripppled health system it could reach it's 3% potential and that would be the greatest catastrophy in human history. 

It could.

The plague killed about 25 million over centuries on a world population of about 500 million.
In 1918 the Spanish Flu killed 20 to 50 million people, around 500 million infected on a world population of about 1.7 billion.
WW2 killed 75 million people of about 2.4 billion.

Today we have around 7.7 billion people.
With a low estimate of 2% deaths out of 40% infected, 62 million, high estimate of 5% deaths out of 70% infected, 270 million.
That is, if it can't be contained long enough to find better ways to increase survival odds.

Another problem is that it can become like the flu, going round and round until it can be eliminated by successful vaccines like measles etc.