Each year, the fungal disease valley fever infects tens of thousands of people in the American Southwest. Studies suggest infection rates could be even higher among dogs, however, and researchers in Arizona are now announcing progress on a canine valley fever vaccine. Valley fever is caused by a fungus that grows in arid soil. Fungal spores can become airborne due to wind, construction or other activities that disrupt the soil, and inhaling the spores can lead to an infection in the lungs that