During pregnancy, most women receive Tetanus injections, but talking to your gynaecologist will help you know how to protect yourself and your baby from Tetanus, Diphtheria & Pertussis. Tetanus is a nerve disease; Diphtheria is a serious throat infection that can block airways and Pertussis, a contagious respiratory disease, can lead to hospitalisation in infants less than 2-months of age.