The Zulacin Virus

The Zulacin Virus is a slightly deadly disease on Eura.  It is normally found in the Akatree biome.  It infects birds and mammals.  It causes yellow circle shaped scars to emerge on its host and hair loss.  Minor bloating comes after two weeks.  After this coughing rapidly increases, vomiting starts two weeks later, now there is a 50:50 chance the host will die or the virus will slowly die out.  It spreads through coughing, water, vomit and faeces.  It is quite infectious but some birds and mammals have developed strong immune systems that are able to defend against the virus.  Its microscopic shape is similar to bacteria phages on earth.  They are known to rapidly replicate in the right sort of host, like Occan birds, which have learnt to avoid the disease at all costs.