Arnon's Madness - Disease

A disease that is transmitted through an infected subjects proboscis. An infected creature will open its mouth unnaturally wide, much like a snake unhinges its mouth, and forces a stake like proboscis out towards its target. 
This disease has a low constitution threshold to resist but once one is infected it is nearly impossible to recover, usually sounding a death sentence. After several days of failed attempts to recover, the sickened subject will eventually succumb to the disease process and die.  They are then reanimated shortly after and begin trying to infect other living creatures around them.