How is avian influenza transmitted?

The avian influenza virus is shed in the saliva, nasal secretions and droppings of infected birds. Some species of birds will appear sick when infected but other species, particularly wild waterfowl and domestic ducks, may not show any symptoms of infection but will still excrete the virus. Once excreted, the virus can survive in the environment for some time, even weeks in certain temperatures and conditions.

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