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Chlamydia psittaci is a bacterium that primarily infects birds but can also cause respiratory infections in humans, known as psittacosis. It spreads through inhalation of contaminated particles from bird feathers, feces, or respiratory secretions. Symptoms in humans include flu-like signs and, in severe cases, pneumonia. It is treated with antibiotics like tetracyclines or macrolides." . _:b30242284 .