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Yes. Malaria can be spread around the world if not treated at the time when you see signs of malaria.
They don't.
Malaria is already endemic in may parts of the world.
The increasing population also increases the chances of a world epidemic. If there are more people, there are more chances that people could catch/spread a disease.
A decline of 90% in the New World Indian population
-If you mean what percentage was affected, then it was 33%. -If you are asking what area of the world , it was mainly Europe that Black Death was affecting.
The population of the world exceeds 7 billion people and is still climbing. An estimate of the population presently can be found at the link below.
It will be hard to completely stop. Malaria is a preventable and treatable disease. The problem is that many parts of the world don't have the access to the necessary medication. It means many people die needlessly. So the way to reduce it is to get those medications to the people that need it.
From playing World of Warcraft
no
Yes, malaria is endemic widely across the world.
In still developing/ poor countries