Scientists is Brazil have found that the countries most affected by the coronavirus spread are the ones who continued to allow unrestricted travel across their borders, prompting further arguments that the most effective method of preventing the spread is tighter frontier controls.

The research, carried out by the Federal University of Bahia in Salvador, suggests that screening and quarantining those coming into countries from outside could have been “a cheap solution for humanity”.

The researchers based their analysis on records of 7,834 airports, using online flight databases documenting 67,600 transport routes in 65 countries.

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