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Exactly my thought. Not to mention, our University extension guy says that is how Avian flu spread to humans. In Asian countries, people brought their chickens in at night. They were trying to prevent people from stealing their chickens. But, not a healthy thing to do.
Katherine
The exact reason avian flu mutated into a form that was contracted by humans is no really known. Those that did get it were workers in crowded chicken houses. Few contracted the disease. By your logic people should not keep parrots as pets.
If people keep rodents on their house, why not chickens. Rodents, especially rats, are closely related to us and are vectors for many diseases. That is why they use rats, mice and monkeys to study human diseases. Chickens are distantly related to us. The diseases they have rarely effect humans.
This does not mean I advocate keeping ten chickens in your house.