Registrations, Licensure Requirements or Certifications: Current registration as a Dietitian (R.D or R.D.N.) with the American Academy of Nutrition and Dietetics Commission on Dietetic Registration and licensure as a Dietitian (L.D.) with the Texas State Board of Examiners of Dietitians. 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.