Diseases such as Ebola, and quarantines, were quite common until about 50 years ago. All they have to do is dust off their old laws and go back to the procedures then used – which included quarantines of travellers from affected countries. Given the way the world’s economy is connected, anything other than a short term travel ban would disrupt the economy which is why no one is discussing it. Fortuantely ebola isn’t very contagious (unlike influenze or smallpox), and while it is more contagious than AIDS (HIV) it still isn’t a big threat to places with functional public health systems (which includes most of Africa, except for a few countries that destroyed their public health system recently with messy civil wars).
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