A person receives a COVID-19 vaccine in a file image. (Photo by: Jose More/VWPics/Universal Images Group via Getty Images) SACRAMENTO, Calif. - California is nearing approval of Pfizer’s coronavirus vaccine for its 2.1 million children ages 12 to 15, state health officials said Tuesday, one day after the federal government expanded its use.Nationally and in California, the shots are set to begin Thursday after a Centers for Disease Control and Prevention vaccine advisory committee issues recommendations Wednesday for using the two-dose vaccine in children as young as 12.In California, Nevada, Oregon and Washington, the Western States Scientific Safety Review Workgroup is independently reviewing the U.S.