A 64-year-old man arrives at a hospital emergency room with signs and symptoms of serious pulmonary infection. He complains of a deep cough, bloodtinged sputum, night sweats, and weight loss. His liver and spleen feel enlarged upon physical examination. X-ray studies of his chest suggest tuberculosis, but a tuberculin skin test is negative, as is an HIV test. The man, an Ohio native, has recently traveled to Africa and Asia. He is also an avid bird enthusiast who likes to feed pigeons. He also keeps many bird feeders on his balcony, which attracts numerous birds, and he spends an hour a day cleaning up bird droppings. Skin tests are positive for histoplasmosis but inconclusive for y traveled to Africa and Asia. He is also an avid bird enthusiast who likes to feed pigeons. He also keeps many bird feedersIs this desease unusual for people that work with birds?