Introduction: The recent outbreak of bird flu in the USA in April 2024, its threat in the form of global expansion, and fear of the pandemic compelled all of us to know about it and take the appropriate measures to stop its spread. Here we will try to understand: what is bird flu? its variants, symptoms, future threats, preventive measures, remedies, etc. So, let's start here: What is Bird Flu? Bird means Avian and Flu means Influenza, So Bird Flu or Avian Influenza are the same. Viruses of Bird Flu are naturally found in aquatic birds and mammals. Bird flu viruses from aquatic birds/mammals,  reached wild birds/animals by the various ways of contact. Later on, it reached domesticated birds in similar ways. Most viruses do not harm them. There are 3  types (A, B, and C) of  Bird flu viruses. Only type A is responsible for spreading it to humans. All subtypes of A virus are not capable of spreading to humans. All strains (traces) of a sub-type of the virus are not capable o