Throughout U.S. history, people have benefited from improvements in the field of public health. The availability of clean water, the development of sewage systems, and other effective interventions worked to cut the rate of disease in entire segments of the population at relatively low cost. Vaccination is an intervention that has proved effective in terms of cost and effort in protecting the population from disease.
Individuals clearly benefit from the disease protection offered by vaccinations. In addition, if vaccination levels are high enough within a population, protection may be extended to those unable to be vaccinated, either due to a medical restriction or because they are too young. This is because without enough susceptible individuals acting as “carriers,” the disease can’t effectively be transmitted from person to person. The ideal situation is when the disease is eradicated. This has only happened once in recorded human history, with smallpox. We need enough participation in vaccination programs so both individuals and society can enjoy the benefits of freedom from disease.
As a scientist, the recent backlash against vaccines and decision by some parents not to have their children vaccinated concerns me. The use of vaccines is a societal process of risk and benefit, not only for individuals but for everyone. We have a basic tenet in society: balancing an individual’s right to choose with that person’s duty to protect him or herself, any children, other loved ones, and society as a whole.
Some of the information circulating in today’s media about vaccines isn’t scientifically based; instead, it’s based on emotion. Measles was declared eliminated in the United States in 2000 because people were vaccinated against it at such high rates that there was no continuous disease transmission. Measles is now making a comeback as a substantial portion of the population has chosen not to be vaccinated against it. Approximately 1 per 1,000 individuals who gets measles will have a serious adverse outcome that can include life-long disability or death. Neurological complications can occur from measles – it’s a potentially dangerous disease that’s completely preventable.
A complicating issue for society is that some individuals who would normally take a vaccine for some diseases can’t be vaccinated for medical reasons. They’re either too young or have an immune deficiency or some other limiting factor. These people are now being exposed to unnecessary risk by others who have declined to take a vaccine because they have a belief against it for whatever reason.
Of course, measles isn’t the only disease that can be controlled by vaccinations. Others include:
Mumps. We know that mumps often doesn’t cause as many problems as measles long term, but mumps does have serious potential consequences. There was a recent outbreak of mumps among active-duty personnel. This is likely because the mumps portion of the MMR vaccine isn’t as effective initially as the measles or rubella portions, and even in those who have an initial immunity to mumps, the protection declines more rapidly than the other portions over time. There’s no current recommendation or policy to revaccinate people against mumps, except during a mumps outbreak, so mumps still occurs.
Whooping cough (pertussis). This disease more often causes complications and serious diseases in children. We have policies for certain DoD-run activities, such as day care centers, requiring individuals to be vaccinated against pertussis. The policies were put in place primarily because of the potential for children to spread it to other children, with potentially serious complications.
Hepatitis A. This disease is most commonly transmitted through contaminated food or water. It is currently a routine childhood vaccine. We vaccinate all service members for hepatitis A.
Influenza. Every year we offer an influenza vaccine. We require all service members to get it, and we offer it to all beneficiaries. The “flu shot” is especially important for populations targeted by CDC as “higher risk,” including children from six months to about 9 years of age and pregnant women. The CDC has recommended that everyone get the vaccine, but public health professionals struggle to reach a rate as high as 50 percent. Other than for service members, the decision of whether or not to receive the influenza vaccine remains with the individual. While we provide guidance and counseling to assist them, the individual must balance any concerns about the vaccine with the potential benefits of not getting flu.
Additional vaccinations are critical in the military, beginning in basic training when large numbers of individuals from around the country are housed together. The adenovirus vaccine is given because this upper respiratory infection can cause significant lost time during training, and on rare occasion it can have more severe consequences, including death.
Other vaccines are required for military personnel because of their occupations or the potential risks they might face – like anthrax and smallpox. Some vaccines are given to warfighters as protection against diseases we don’t worry about in the United States; these diseases, including meningitis and yellow fever, cause problems elsewhere. Our service members must be as ready as possible at all times, and a medically ready force must be free of potentially disabling and disability-producing diseases. At this time, vaccines are among the most effective tools we have to reduce the risk of a service member acquiring a preventable disease.
Regarding vaccines, the military follows Centers for Disease Control and Prevention guidelines for the general population, except in the specific cases just mentioned where vaccines are required for military reasons.
In a sense, the effectiveness of vaccines to control and eliminate diseases causes a problem: Vaccines are a victim of their own success. Many people think they don’t need to protect themselves anymore, that the diseases eradicated here are now somebody else’s problem in another part of the world. The current measles outbreaks demonstrate the flaw in this reasoning. Our emphasis in public health in general is that vaccines are good, and the need for them is ongoing. The vaccines we use are proven safe and effective. Any risk from a vaccine pales in comparison to the benefit to the individual and to society. The scientific evidence is clear: Vaccines are a public health success.