
"Children who have received no vaccines: who are they and where do they live?"

#1-"Fatality Rates of Smallpox in the Vaccinated and Unvaccinated"
https://www.bmj.com/content/1/3498/116.1?tab=related
#2-"Immunology and Vaccine-Preventable Diseases – Pink Book - Polio"
https://www.cdc.gov/vaccines/pubs/pinkbook/downloads/polio.pdf
#3-"Children who have received no vaccines: who are they and where do they live?"
https://www.ncbi.nlm.nih.gov/pubmed/15231927
#4- Refer to #1.