4 ms·Denmark is building a 'wall' on its German border. To stop pigs1 points by ohiovr 8y agoohiovr 8y agoAfrican swine fever is highly contagious and has a near 100% mortality rate. Only affects swine thankfully.jtlienwis 8y agoThe Danes have been working on walls to separate from Germany from at least the time of Charlemagne. Its called the Danevirke.