How are avian, pandemic, and seasonal flu different? Avian flu is caused by avian influenza viruses, which occur naturally among wild or domesticated birds. Pandemic flu is caused by a flu virus that has mutated from an animal form of the virus and has developed the ability to spread from human-to-human. This may result in a global (pandemic) outbreak. Currently there is no pandemic flu. Seasonal flu is the contagious respiratory illness caused by influenza viruses.
Other emerging diseases that have appeared in Berrien County