Psittacosis is an infection that is passed to humans from birds. It may cause a variety of flu-like symptoms.

Bacteria as Seen Through Microscope
Bacteria
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Psittacosis is caused by a specific bacteria. The bacteria is passed from a sick bird. People may come in contact with the bacteria when they inhale the dust of dried bird droppings from the sick birds. The bacteria can also pass when a person touches his or her mouth to the beak of an infected bird. Even minor contact with sick birds can lead to psittacosis. The bacteria can pass from one person to another, but it is rare.