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Avian flu (also known as highly pathogenic avian Influenza or HPAI, avian influenza, or bird flu) is a viral infection caused by influenza type A viruses. It primarily affects wild birds and domestic poultry. The H5N1 strain is of particular concern because it can spread rapidly and potentially infect non-avian species, including mammals like dogs, cats, zoo animals and some wild carnivores. During outbreaks, keep pets and livestock away from wild birds and their droppings.