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human
ELI5:Why do countries like the US and Canada have civilian flights available to Ebola infected countries like Liberia?

I was surprised to learn that the first Ebola case came from a passenger who simply flew from Liberia to Dallas. Shouldn't they have stringent testing or guidelines before allowing someone to board a plane from an area so infected? I feel like allowing someone to board just because they don't have a fever is a terrible idea. Couldn't they be carrying the disease on their clothes?
gpt
>  Shouldn't they have stringent testing or guidelines before allowing someone to board a plane from an area so infected?

They do, they check for a fever. This is really all that is required at this point because only an infected AND symptomatic person can spread the disease. You can have the disease and not be infectious. 

>  Couldn't they be carrying the disease on their clothes?

No, absolutely not. The virus is contained within bodily fluids (blood, saliva). It cannot be airborne (e.g. sneezing, coughing). It cannot survive outside the human body on surfaces (e.g. door handles, armrests). Therefore the risk of transmission from one person to another, even on a plane is extremely low. 

This man became symptomatic AFTER he left the plane and airport. Thus there is no risk to anyone who travelled with him. Everyone (friends, family) who he came into contact with during those two days while was symptomatic are being tested. He is already in quarantine. The situation is controlled.

> Why do countries like the US and Canada have civilian flights available to Ebola infected countries like Liberia?

Because these are major hubs for getting into and out of Africa. A lot of passengers probably aren't even staying in the region but are taking flights elsewhere. The risk to airline passengers at this point in time is very low. The outbreak is really confined at this point to locals and health professionals working on the ground in affected areas.