Since it is already 50 to 60 percent deadly, there is no need to be more deadly in order to be a nightmare from hell.

Are you on drugs? Your inabilty to see self deception in your own words as astounding.

It only needed to be more transmissable, which it now is!

Now that it is adapted to life in a human, it only requires time to learn how to spread more effectively.

You can also surmise from the adaptation to our body temperature range, that it has also developed a degree of adaptation to spreading. If it had not, it would not have had the opportunity to both adapt to the temperature, and survive long enough to be found.

It has also been found in canada geese in the UK and in Australia which migrate globally, so there is no safe place on this planet.