Learn how to prevent and manage sticktight fleas. They are smaller and less mobile than common fleas, but they love chickens and other poultry.
While it's true that opossums sometimes eat eggs and kill chicks and chickens, it's better to safeguard your hens than try to eradicate them from your property.
Make sure to call law enforcement to investigate and document what happened. If the attacks continue, there are various ways you can proceed.
When it comes to a chicken allergy—and we're talking the live animal here, not what's for dinner—the two main instigators are a bird's feathers and its droppings.