Heading into peak flu season, San Diego County is seeing its highest rates of flu cases in five years, public health department data shows. The big picture: A "quad-demic" of illness is hitting simultaneously this winter with high levels of influenza A,

Three San Diego County teenagers have recently died from the flu, according to local health officials. The San Diego County Health Department made the announcement Thursday and said none of the teens were vaccinated.

Three teenagers are among 73 individuals who have died from the flu this season, according to San Diego County’s latest respiratory virus data, a statistic that has prompted public health officials to re-promote vaccinations.

The county's latest flu vaccine reminder comes after three unvaccinated teenagers died from the virus this flu season.

In San Diego County, nearly 80 percent of 5- to 17-year-olds have not received this flu season’s vaccine, said interim public health officer Dr. Ankita Kadakia.