At least 19 people contract fungal infection after California music festival, officials say

New research shows that cases of valley fever, which in rare cases can be fatal, have risen dramatically in recent years

At least 19 people contracted valley fever, a fungal infection that in rare cases can be fatal, after attending an outdoor music festival in southern California in May, public health officials have reported.

The number of illnesses associated with the five-day Lightning in a Bottle event has almost quadrupled over the last month. Valley fever is caused by inhaling Coccidioides, a fungus endemic to the soil of the US south-west. New research shows that cases of the illness have risen dramatically in recent years.