*HCP refers to all paid and unpaid persons working in health care settings who have the potential to be exposed to patients or infectious materials and have the potential to transmit influenza to and from patients and other HCP. HCP are direct care providers (e.g., physicians, nurses, nursing assistants, therapists, technicians, emergency medical service personnel, pharmacists, laboratory personnel) as well as persons not directly involved in patient care (e.g., clerical, dietary, housekeeping, laundry, security, maintenance, administrative, billing). HCP include employees paid by the health care facility and other professional, contract, and other staff not directly paid by the health care facility. CDPH reports data separately for hospital employees, licensed independent practitioners, contract personnel, and students, trainees, and volunteers.