Diphtheria/Tetanus/Pertussis, Infanrix (DTPa) is a combination vaccine which helps to prevent three diseases, each caused by a different infection. The diseases are Tetanus,Pertussis and Diphtheria

Dip/Tetanus/Pertussis Infanrix (DTPa) is given to children 2 months upwards

This vaccine is Mercury/Thiomersal free.  Manuafacturer GlaxoSmithKline
For more detailed information on Infanrix click on this sentence

There is currently no single vaccine available for Pertussis