| Serotypes 18C and 19F are conjugated to tetanus toxoid and to diphtheria toxoid, respectively. |
| The bivalent toxoid, Td, is not considered to be significantly more reactogenic than T alone and is recommended for use in this circumstance. |
| Following adequate immunization with diphtheria toxoid, it is generally accepted that protection persists for at least 10 years. |
| One third of infants do not receive routine immunization in the form of three doses of diphtheria, pertussis and tetanus toxoid vaccine. |
| A toxin which has lost its poisonous property, its toxophore group, is spoken of as a toxoid. |
| Active immunization by vaccination with tetanus toxoid is now usual in childhood, along with diphtheria and whooping cough vaccines. |
