Natural infection may not induce a durability and completeness of protection that is equivalent to vaccines, as seen with HPV, tetanus, and conjugate pneumococcal vaccines.

“I mean the vaccine there are certainly a number of vaccines the human papillomavirus vaccine is one example tetanus is another the conjugate hibbon pneumococcal vaccines are another example where the vaccination is better than natural production in terms of the immunity to seduced that may also be true here”