Monday, June 30, 2008

Identifying Misinformation About Vaccine Safety

How can you distinguish good information from misinformation? Misinformation often includes one or more of the following elements:

  • Invalid assumptions. An invalid assumption is something you treat as if it were known to be true or false, when in fact it is not. For example, some parents regard hepatitis B immunization as unnecessary, assuming that this is a disease for which their children are not at risk. This is an invalid assumption (read here to know why).
  • Logical Fallacies. A logical fallacy is a flaw in an argument that makes the argument illogic or invalid. Some common logical fallacies are ad hominem arguments (attacking those presenting the argument rather than the argument itself); appeals to pity (trying to win support for one’s arguments by appealing to feelings of sympathy or guilt); and arguments from ignorance (claiming that a statement is true only because it has not been proven false, or that it is false only because it has not been proven true) among others.
  • Ad hoc hypotheses. An ad hoc (literally, "for this") hypothesis is an adjustment made to a theory just for the purpose of salvaging it from being refuted. Ad hoc explanations try to explain findings that do not fit the original theory.
  • False experts or experts who lack the needed expertise. An expert in one field may be completely ignorant in another field. For instance, an expert endocrinologist may be an expert on diabetes but is not likely to be expert about vaccine safety or immunology. Unfortunately, some who may be experts in one field eagerly make claims about things outside their field of expertise.
  • Pseudoscience. Pseudoscientific claims cannot be verified by other researchers because they are often ambiguous and not measurable. In most cases, these claims are not submitted to peer review (that is, review by experts) before making them public and the methods are usually difficult to understand, making the observations difficult to replicate. Often, data may be represented to show one outcome when another is the case. Other times the methods that are used are likely to give a predetermined outcome. Only data purporting to support the claims is presented while conflicting data are ignored or discarded.

Thursday, June 12, 2008

Press Release: Do Vaccines Cause Autism, Asthma, and Diabetes?

Do Vaccines Cause Autism, Asthma, and Diabetes?

New Book Helps Parents Weigh the Evidence

June 11, 2008

Diana Olson - 703 299 0201

Almost 70% of parents who refuse to vaccinate their children do so because they believe vaccines may cause harm. Indeed vaccines have been blamed for causing asthma, autism, diabetes, and many other conditions--most of which have causes that are incompletely understood. Some parents believe that vaccines can “overwhelm the immune system.

To respond to these concerns about vaccine safety, the National Network for Immunization Information (NNii) writing team of Martin G. Myers, MD, and Diego Pineda have written a book titled, Do Vaccines Cause That?! A Guide for Evaluating Vaccine Safety Concerns.

“The authors of this volume have recognized the absolute need to provide parents with clearly understandable, science-based information about vaccines, immunization, and vaccine safety,” write Samuel Katz, MD, of Duke University and Louis Sullivan, MD, of Morehouse School of Medicine, in the Foreword to the book.

This 272-page book is divided in two sections. The first section tells parents how best to weigh and evaluate what they read or hear about vaccine safety, emphasizing how scientists determine whether a vaccine actually causes a specific effect. The second section deals specifically with vaccine safety concerns such as asthma, autism, and autoimmune diseases, among others. The overall theme is to help parents arrive at conclusions based on science.

Dr. Myers is an internationally recognized vaccine expert and former director of the National Vaccine Program Office. He is presently a professor in the Department of Pediatrics at the University of Texas Medical Branch at Galveston (UTMB). Mr. Pineda has been NNii’s science writer since 2004.

Do Vaccines Cause That?! is available for $14.95 at and, where the electronic version is also available for just $12.95.

Do Vaccines Cause That?! A Guide for Evaluating Vaccine Safety Concerns by Martin G. Myers, M.D., and Diego Pineda, M.S. Original edition. 5.5 x 8.5, 272 pages, 12 illustrations. ISBN 978-0-9769027-1-3. $14.95. See our pressroom room for a 300 dpi TIF of the cover.

The National Network for Immunization Information (NNii) provides up-to-date, science based information about immunizations to health professionals, the public, policymakers, and the media. NNii is based at the University of Texas Medical Branch in Galveston and is affiliated with the Infectious Diseases Society of America, the Pediatric Infectious Diseases Society, the American Academy of Pediatrics, the American Nurses Association, the American Academy of Family Physicians, the National Association of Pediatric Nurse Practitioners, the American College of Obstetricians and Gynecologists, the Society for Adolescent Medicine and the American Medical Association.

Friday, June 6, 2008

Pertussis: Lessons from a returning disease

I would encourage you to read this post about whooping cough, not only because it quotes my book, but because it illustrates the point with a passionate voice: not vaccinating is a dangerous gamble. Pertussis (whooping cough) is an ugly disease. Watch the video on the link above to see what it does.

Tuesday, June 3, 2008

Too Many Vaccines?

This post was adapted from Do Vaccines Cause That?! A Guide for Evaluating Vaccine Safety Concerns.

In the early 1940s only one vaccine was given routinely: smallpox. Later that decade, the diphtheria, pertussis, and tetanus vaccine began to be given routinely. Now, by the time a newborn is 12 years of age, she will have received 30-35 doses of vaccines to protect her against 34 diseases.

Looking at the number of shots given at each pediatric visit, many parents wonder whether a baby’s immune system can withstand so many immunizations—almost half of the parents in a survey expressed this concern as a reason for not vaccinating their children.(1)

Can a children’s immune system handle all those vaccines? (2-5) The answer seems to be yes it can.

  • Even though a newborn’s immune system cannot respond to all the different types of foreign materials (called antigens), they do have an incredible ability to respond to an extremely large number and types of antigens.
  • Compared to 1980—because of newer ways of making vaccines—the number of antigens in vaccines has actually decreased even though more vaccines are given. (2)
  • Before each of these vaccines can be licensed in the United States, they have to be shown to effectively stimulate the immune system—for all the vaccine components—and to be effective along with all the components of vaccines that would usually be given at the same time.
  • A number of studies have observed no increased risk of other types of infections after vaccines and some have even shown fewer infections in immunized children.(4, 6 , 7) One study could find no effect on hospital admissions for other types of infections and how many and which vaccines a child had received—among all the children born in Denmark born from 1990 through 2001. (6)

The fact is that vaccines strengthen, not weaken, the immune system. This is true even for newborn infants. On the other hand, a natural infection clearly can weaken a child’s immune system. For example, a previously healthy child with chickenpox (varicella) may become infected with dangerous bacteria, resulting in an infection severe enough to require hospitalization or even cause death. Similarly, a child with measles infection is more likely to develop middle ear infections.

Infants and children are bombarded with germs every day in the air they breathe and the food they eat, but their immune systems are able to handle these exposures. The vaccines that are recommended for all children use only a small portion of the immune system’s “memory.” Scientists estimated that based on the immune system’s capacity to respond, a child could theoretically get 10,000 vaccines in one day and still not “use up” his or her immune ability to respond. (2)


1. Daniel A. Salmon, PhD, MPH; Lawrence H. Moulton, PhD; Saad B. Omer, MBBS, MPH; M. Patricia deHart, ScD; Shannon Stokley, MPH; Neal A. Halsey, MD. Factors Associated With Refusal of Childhood Vaccines Among Parents of School-aged Children: A Case-Control Study. Arch Pediatr Adolesc Med. 2005;159:470-476.

2. Offit PA, Quarles J, Gerber MA, et al. 2002. Addressing parents concerns: do multiple vaccines overwhelm the infant’s immune system. Pediatrics. 109(1): 124-9.

3. Hilton S, Petticrew M, Hunt K. 2006. ‘Combined vaccines are like a sudden onslaught to the body’s immune system’: parental concerns about vaccine ‘overload’ and ‘immune vulnerability’. Vaccine 24: 4321-7.

4. Gregson AL, Edelman R. 2003. Does antigenic overload exist? The role of multiple immunizations in infants. Immunol Allergy Clin N Am. 23: 649-664.

5. Gellin BG, Maibach EW, Marcuse EK, et al. 2000. Do parents understand immunizations? A national telephone survey. Pediatrics 106(5): 1097-1102.

6. Hviid A, Wohlfahrt J, Stellfeld m, et al. 2005. Childhood vaccination and nontargetted infectious disease hospitalization. JAMA 294(6): 699-705.

7. Institute of Medicine Immunization Safety Review Committee. Multiple immunizations and immune dysfunction. National Academy Press, Washington, DC, 2002.