Thank you so much for your help!
I believe we have this fixed for the next HealthFrame v3 beta (b9).
The current list of immunizations in HealthFrame that contain the word tetanus are:
C0039620 Tetanus Vaccine
C0058773 Diphtheria-Tetanus (DT) Vaccine
C1314123* Tetanus, Diphtheria Toxoids and acellular Pertussis Vaccine (Tdap)
C0535644 Diphtheria-Tetanus-Acellular Pertussis (DTaP) Vaccine
C0012559 Diphtheria-Tetanus-Pertussis Vaccine
C0215600 Diphtheria + Pertussis + Tetanus + Haemophilus Influenzae Type B Vaccine
C2054267* Tetanus-Diphtheria Vaccine (Td)
The two with the '*' after the concept id are additions in HealthFrame v3.