There is no risk of catching this disease from a person who has the disease.
Once a person becomes infected with Valley Fever they cannot pass the fungus on to anyone else by coughing, sneezing, sharing food, using the same eating utensils/drinking glass, coming in contact with the persons clothes or bedding, or any other typical way of catching a disease.
Valley Fever can only be caught by breathing in spores that are in the air that were growing in the ground. Naturally occurring winds and other activities (to a lesser extent) release the spores into the air which are then inhaled when we breathe air. After entering our body through our lungs, the fungus changes to a different form called a spherule which cannot be passed on to others. For more information on the two forms (human versus soil), see the page on Ecology of Valley Fever.