Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
Zoonotic diseases are infectious diseases that can be transmitted from animals to humans. These diseases can be caused by viruses, bacteria, parasites, or fungi.
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Birds are common carriers of several zoonotic diseases such as avian influenza and psittacosis.
Zoonotic diseases can spread through direct contact with infected birds, their droppings, or contaminated environments.
Avian influenza is a viral infection that affects birds but can also infect humans, often leading to severe respiratory issues.
Psittacosis, also known as parrot fever, is caused by the bacterium Chlamydia psittaci and can result in flu-like symptoms in humans.
Wild and domesticated birds alike can serve as reservoirs for zoonotic pathogens, making proper handling and hygiene essential.
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Related terms
Avian Influenza: A viral infection that primarily affects birds but can also infect humans.
Psittacosis: A bacterial infection caused by Chlamydia psittaci that can be transmitted from birds to humans.
Reservoir Host: An animal species that harbors a pathogen without being affected by it and serves as a source of infection for other species.