San Diego County is seeing an outbreak of flu much earlier than in previous years. The number of confirmed cases is three times higher than in December 2016.
Across the country, health officials are bracing for what could be a difficult flu year, with a longer season and a serious strain of flu virus. Some experts also worry this season's flu vaccine might not be as effective towards the influenza strain infecting people this year.
Dr. Wilma Wooten, San Diego County public health officer, discusses the elevated flu activity Thursday on Midday Edition.