What caused Bird Flu?

Bird flu, also known as avian influenza, is caused by influenza viruses that primarily affect birds. These viruses belong to the influenza A virus family, specifically subtypes such as H5N1, H7N9, and H9N2. The exact origin of bird flu is not always clear, but it typically spreads among wild birds, especially waterfowl like ducks and geese.

Transmission to domestic poultry can occur through contact with infected wild birds, contaminated water, or contaminated equipment and surfaces. Human cases of bird flu usually result from direct contact with infected birds or their droppings, as well as from handling or consuming contaminated poultry products.

The virus can mutate, leading to strains that are capable of infecting humans. While most cases of bird flu in humans are relatively rare, they can be severe, and there is concern about the potential for a pandemic if a highly contagious strain were to emerge that spreads easily among humans.