According to the Centers for Disease Control and Prevention, healthcare workers are considered to be at significant risk for acquiring or transmitting hepatitis B, measles, mumps, rubella, varicella (chicken pox), tetanus, diphtheria, pertussis (whooping cough), and influenza. Registrations, Licensure Requirements or Certifications: Must have one of the following: Licensed Psychological Associate (LPA), Licensed Professional Counselor (LPC), Licensed Clinical or Master Social Worker (LCSW or LMSW), or Licensed Marriage and Family Therapist (LMFT) or a Board-Certified Behavior Analyst (BCBA).