Commission Implementing Decision (EU) 2017/1839 of 9 October 2017 amending Implementing Decision 2013/426/EU on measures to prevent the introduction into the Union of the African swine fever virus from certain third countries or parts of the territory of third countries in which the presence of that disease is confirmed and repealing Decision 2011/78/EU (notified under document C(2017) 6672) (Text with EEA relevance. )