Dental assistants are strongly encouraged to have current vaccinations for Hepatitis B, and Tetanus along with the normal childhood vaccination recommendations (Measles, mumps, varicella, polio) and influenza. Many state and territory public health care facilities and training providers will require students and workers to present evidence of Hepatitis B immunity and the results of a criminal history check prior to commencing clinical placement. Most private dental clinics will also require employees to have current vaccination records and may also require workers to undertake annual influenza vaccinations.