Primum non nocere is Latin for First, do no harm, one of the guiding principles of medical care. Yet there is a large body of scientific evidence confirming numerous vaccine safety deficits that counteract well-publicised benefits. For example, several studies in this book show that mercury and aluminium in vaccines can cause neurological, immunological and developmental harm. Other studies show that childhood vaccines are associated with an increased risk of cancer, allergies, seizures, bleeding disorders, and type 1 diabetes. The peer-reviewed scientific studies in this book also show that...A history of measles and mumps is protective against fatal heart attacks and strokes. The pertussis vaccine caused virulent vaccine-resistant strains of pertussis to emerge. Chickenpox vaccines reduced cases of chickenpox but increased cases of shingles. Children have an increased risk of requiring emergency care after receiving MMR. Vaccinated people can spread disease, making herd immunity an unrealistic goal. Many doctors and nurses are unvaccinated due to concerns about adverse reactions. Parents who reject vaccines for their children are highly educated.