Which pneumonia-causing organism is specifically linked to avian exposure?

Chlamydophila psittaci is the organism specifically associated with avian exposure, commonly causing a type of pneumonia known as psittacosis. This bacterium is typically transmitted to humans through direct or indirect contact with infected birds, especially parrots, cockatiels, and pigeons. Individuals who work closely with birds, such as veterinarians, pet shop employees, or breeders, are at an increased risk of infection.

The disease often presents with flu-like symptoms, including fever, chills, and respiratory distress, and can lead to pneumonia in severe cases. Given its transmission route and clinical presentation, Chlamydophila psittaci is distinct from the other organisms listed in the question. The other options involve different contexts: Coxiella burnetii is primarily associated with livestock, especially sheep and goats; Klebsiella pneumoniae is a common cause of healthcare-associated pneumonia; and Mycobacterium tuberculosis is responsible for tuberculosis, primarily transmitted through airborne spread from person to person rather than from birds. Therefore, the link between Chlamydophila psittaci and avian exposure makes it the correct choice for this question.