DTP vaccine INCREASES the death rate by 5 to 10 times compared to unvaccinated children…The Introduction of Diphtheria-Tetanus-Pertussis and Oral Polio Vaccine Among Young Infants in an Urban African Community:A Natural Experiment…When DTP and OPV were introduced in Guinea-Bissau in 1981, allocation by birthday resulted in a natural experiment of being vaccinated early or late…Between 3 and 5 months of age,children who received DTP and OPV early had 5-fold higher mortality than still unvaccinated children.

http://www.ebiomedicine.com/article/S2352-3964%2817%2930046-4/fulltext?ct=t%28%29