A vaccine is a biological preparation that provides active acquired immunity to a particular disease. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins or one of its surface proteins. The agent stimulates the body's immune system to recognize the agent as a threat, destroy it, and recognize and destroy any of these microorganisms that it later encounters.


Debunking Common Myths - Vaccine FYI
Science-based information about vaccines. Counteracting the rampant misinformation about vaccines published online, so that you can make the confident decision to vaccinate yourself, your children, and your pets. Vaccines are safe, effective, and necessary.

History of Vaccines - The College of Physicians of Philadelphia
The History of Vaccines is an award-winning informational, educational website created by The College of Physicians of Philadelphia, one of the oldest medical societies in the United States. A group of prominent Philadelphia physicians, including Declaration of Independence signer Benjamin Rush, established the College in 1787 "to advance the science of medicine and to thereby lessen human misery."

Vaccines - Red Wine & Apple Sauce (blog), By Tara Haelle
Tara Haelle writes a lot about vaccines, and hersite has become a resource for many seeking answers about vaccines because she tries to be very conscientious about linking to original studies and transparent about the known risks of vaccination, creating a resource page for new visitors.

Vaccines — Calling the Shots - TV Program (53:10), PBS NOVA
Diseases that were largely eradicated in the United States a generation ago — whooping cough, measles, mumps — are returning, in part because nervous parents are skipping their children's shots. NOVA's "Vaccines — Calling the Shots" takes viewers around the world to track epidemics, explore the science behind vaccinations, hear from parents wrestling with vaccine-related questions, and shed light on the risks of opting out.

Vaccines and Herd Immunity - Research on Complex Systems
When a person vaccinates against an infectious disease this not only protects that person. The acquired immunity is also beneficial to the rest of population because the immunized person can no longer be a potential transmitter. This cumulative social effect is known as herd immunity. Herd immunity implies that a disease can be eradicated if the fraction of the population that is immune exceeds a critical value.

Vaccines & Immunizations - Centers for Disease Control and Prevention
Learn about protecting your child from infectious diseases, vaccine requirements for day care and school; vaccines you need determined by your age, lifestyle, health conditions, job, international travel; Learn how staying up to date on your vaccinations is all part of a healthy pregnancy, and much more.

Vaccine Safety: Examine the Evidence - American Academy of Pediatrics
The safety and effectiveness of vaccines are under constant study. Because vaccines are designed to be given routinely during well-child care visits, they must be extraordinarily safe. Safety testing begins as soon as a new vaccine is contemplated, continues until it is approved by the FDA, and is monitored indefinitely after licensure. The American Academy of Pediatrics (AAP) works closely with the Centers for Disease Control and Prevention (CDC) to make recommendations for vaccine use. Please examine the evidence for yourself. If you have any questions, speak with your pediatrician.

HPV (Human Papillomavirus) Vaccine

Gardasil® 9 Patient Information, Medication Guide - PDF, FDA
Human Papillomavirus 9-valent Vaccine, Recombinant. Read this information with care before getting GARDASIL®9. This information does not take the place of talking with your health care professional about GARDASIL®9

Gardasil vaccine safety - FDA
Information from FDA on the Safety of the Gardasil Vaccine.

Human Papillomavirus (HPV) Vaccine (Gardasil) - MedlinePlus
Genital human papillomavirus (HPV) is the most common sexually transmitted virus in the United States. More than half of sexually active men and women are infected with HPV at some time in their lives. HPV can cause cervical cancer in women. Cervical cancer is the 2nd leading cause of cancer deaths among women around the world. In the United States, about 12,000 women get cervical cancer every year and about 4,000 are expected to die from it.

Human Papillomavirus (HPV) Vaccine Safety- CDC
Human papillomavirus (HPV) infection is very common. Most people — about 9 in 10 — will get an HPV infection at some point in their lives. HPV infections can cause health problems, including several kinds of cancer in both women and men. There are safe and effective vaccines recommended to prevent these health problems from happening.

Human Papillomavirus (HPV) Vaccines - National Cancer Institute
This resource covers topics such as: what are human papillomaviruses, which cancers are caused by HPV, who gets HPV infections, can HPV infections be prevented, what HPV vaccines are available, who should get the HPV vaccines, how do HPV vaccines work, and more.

HPV (Human Papillomavirus) Vaccine: What You Need to Know (VIS) -, American Academy of Pediatrics
HPV vaccine prevents infection with human papillomavirus (HPV) types that are associated with many cancers, including: Cervical cancer in females, Vaginal and vulvar cancers in females, Anal cancer in females and males, Throat cancer in females and males, Penile cancer in males. In addition, HPV vaccine prevents infection with HPV types that cause genital warts in both females and males.