Hi Dr. Sears, Thank you in advance for help with my question. I'm a little confused about immunity and doses with the polio vaccine. My daughter just turned four and has not had any vaccines since 12 months. At that appointment, she finished her fourth dose of Pentacel. I was reading through your book again last night and am concerned that she may need another polio dose to be immune. I originally thought that she only needed four doses of polio, which she received with the Pentacel shot. However, then I read that one does must be at age 4 or 5. Is that correct? Even though she received four doses of Pentacel does she still have to have another polio shot to have full immunity, or would the four she has already received be enough, even though the last so was at 12 months?
Thanks so much, Ashley