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As the range and incidence of valley fever grows, public health officials are struggling to warn visitors of the risk.

Thompson, a professor of medicine at UC Davis and an expert in the treatment of valley fever and other fungal diseases.

Residents fear the earth-moving work will increase the threat of valley fever — a fungal respiratory infection that is transmitted in dust.

Health officials are alerting Lightning in a Bottle attendees of the potential for valley fever.

Authorities have identified five patients with valley fever who attended the six-day event, which was held May 22-27 at Buena Vista Lake, near Bakersfield.