BRUSSELS - The European Union nations on Friday agreed to impose a ban on travel from southern Africa to counter the spread of a new COVID-19 variant.The 27 nations acted within hours upon the advise of the EU executive which said all needed to be extra cautious in dealing with the variant until it became clear how bad of a threat it would be, the EU presidency said in a statement.RELATED: South Africa variant: WHO calls special meeting on new COVID-19 mutationThe EU presidency, currently held by Slovenia, also called on all member states "to test and quarantine all incoming passengers."Advisers to the World Health Organization are holding a special session Friday to flesh out information about the worrying new variant of the coronavirus.