TY - JOUR T1 - States in Brief JF - The Nation's Health JO - Nations Health SP - 9 LP - 9 VL - 44 IS - 7 AU - Kim Krisberg Y1 - 2014/09/01 UR - http://www.thenationshealth.org/content/44/7/9.2.abstract N2 - California is again experiencing epidemic levels of pertussis, a vaccine-preventable disease. ER -