California egg prices continue to climb due to ongoing outbreaks of highly pathogenic avian influenza. December's statewide average for a dozen large shell eggs reached nearly $9, per a U.S. Department of Agriculture report. The rise is attributed to supply concerns as millions of egg-laying hens have been affected by the virus. The CDC notes no human-to-human transmission of bird flu has been detected, though those working with poultry and animals remain at higher risk. Governor Gavin Newsom declared a state of emergency to address the impacts of the disease.