Legal and Privacy

Medical Advice

The information provided on is for informational purposes only and is not to be construed as medical care or medical advice. It is not a replacement for medical care or advice given by one’s own physicians or trained medical personnel.


The text, graphics, design, and architecture of—except for any products that have been licensed from third parties—are the property of and The College of Physicians of Philadelphia and may not be reproduced or distributed without prior written permission from The College of Physicians of Philadelphia, except insofar as those uses are described as educational fair use by the U.S. Copyright Office in Circular 21.1109. All content created by is protected by U.S. and international copyright and trademark laws. Visitors may not copy, publish, distribute, create derivative works of, or commercially exploit the content of these web pages, or use these web pages for any other purpose than personal and educational use except with specific permission from The College of Physicians of Philadelphia.

Limitation of Liability

All content, material, and links provided by is intended for information and guidance only. Neither nor The College of Physicians of Philadelphia accepts responsibility for any errors, omissions, or inaccuracies in the content, material, or links on this web site. Reference to organizations or persons included on, or any website to which it is linked, does not indicate an endorsement. Neither nor The College of Physicians of Philadelphia takes responsibility or accepts liability for any loss or damage resulting from using this website and its content or any other site to which it is linked.

Moderation Policy

We hold all comments in a queue until our staff reviews them. We invite civil discussion and will approve comments that are polite, on topic, and do not contain personally identifying information. We will not approve comments that are offensive, threatening, off topic, that link to inappropriate sites, or that contain personal attacks or promote commercial products.

College of Physicians staff monitors comments during regular business hours. We make every effort to review comments in a timely fashion, but other work duties may interfere with speedy moderation.


The History of Vaccines makes every effort to protect visitors’ privacy. We do not collect names or email addresses of visitors, except when you opt in to our mailing list or comment on our blog. Those who opt in to our mailing list can be assured that The College of Physicians of Philadelphia does not share the list with other organizations. We do not share information from or about our blog commentors with anyone.

The History of Vaccines uses Google Analytics to monitor site usage. Google Analytics collects information about our site visitors that we then examine to help us understand the needs of our visitors and to improve the site. Google Analytics places a cookie on your web browser to identify you when you visit again. You can disable cookies on your browser if you choose.

We do not combine the information collected through the use of Google Analytics with personally identifiable information about you. Google's Privacy Policy explains your rights as a visitor of a site employing a Google tool. For a more complete description of restrictions on how we are allowed to use data obtained about site visitors from Google Analytics, see Google Analytics Terms of Service, which details our obligations.