User blog comment:Lord Loss/Discussion of the Week: Pseudowyverns/@comment-5043481-20121110191258/@comment-184.38.86.123-20121111204835

The stuff that has infected Tigrex is called Mad Dragon Virus(JP) or Feral Wyvern Virus(U.S. from TGS atleast).It infects mostly wyverns that have either killed an animal that has been contact with Goa Magara(or it's scales atleast since they cause the virus) or have scavenged a kill that was from Goa Magara.The monster doesn't die it just faiths(atleast I think).If it has to do with a parasite than it's possibly an attempt to keep the host alive and keep it strong or mind control from the parasite http://www.youtube.com/watch?v=bT774hw8YxU and http://www.youtube.com/watch?v=lGSUU3E9ZoM. Either way the virus is pretty cool.