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Public Health Rep. 2011; 126(Suppl 2): 3–12.
PMCID: PMC3113425
Highlights of Historical Events Leading to National Surveillance of Vaccination Coverage in the United States
Philip J. Smith, PhD,a David Wood, MD, MPH,b and Paul M. Darden, MDc
aCenters for Disease Control and Prevention, National Center for Immunization and Respiratory Diseases, Atlanta, GA
bUniversity of Florida, College of Medicine, Community Pediatrics, Jacksonville, FL
cUniversity of Oklahoma Health Sciences Center, General & Community Pediatrics, Oklahoma City, OK
Address correspondence to: Philip J. Smith, PhD, Centers for Disease Control and Prevention, National Center for Immunization and Respiratory Diseases, MS E-62, 1600 Clifton Rd. NE, Atlanta, GA 30333, Phone: 404-639-8729, Fax: 404-639-3266, ; pzs6/at/cdc.gov
The articles published in this special supplement of Public Health Reports provide examples of only some of the current efforts in the United States for evaluating vaccination coverage. So, how did we get here? The history of vaccination and assessment of vaccination coverage in the U.S. has its roots in the pre-Revolutionary War era. In many cases, development of vaccines, and attention devoted to the assessment of vaccination coverage, has grown from the impact of infectious disease on major world events such as wars. The purpose of this commentary is to provide a brief overview of the key historical events in the U.S. that influenced the development of vaccines and the efforts to track vaccination coverage, which laid the foundation for contemporary vaccination assessment efforts.
Smallpox outbreaks in Boston
In the budding pre-revolution American colonies, smallpox posed a serious threat to the welfare of a developing nation: mortality from smallpox disproportionately affected Native Americans, and epidemics were recorded among Anglo-Americans in 1677, 1689–1690, and 1702.1 By 1721, the city of Boston had become a prosperous port town of 11,000 residents. Many of those who were older than 20 years of age had contracted smallpox in the epidemic of 1702 and, therefore, were conferred lifelong immunity. However, each year between 1702 and 1721 brought with it a newly born cohort of residents that had not been exposed to the epidemic of 1702, and by 1721 the percentage of Bostonian residents who were susceptible to smallpox swelled.
On April 22, 1721, a British vessel arrived in Boston harbor, passed a quarantine inspection, and docked. Within one day, one of the ship's crew was diagnosed with smallpox and quarantined. By early May, nine more seamen from the ship were determined to have smallpox, and cases began to appear among Boston residents. As the number of smallpox cases mounted, approximately 1,000 residents fled Boston. Then, Onesimus, an African slave of the influential Bostonian Puritan minister Cotton Mather, informed Mather about variolation, a centuries-old procedure practiced throughout Africa2 that protected against smallpox by cutaneous insertion of material from smallpox pustules.
Thereafter, Mather preached fervently in favor of variolation3,4 and convinced a Boston physician, Zabdiel Boylston, to use variolation on 282 Boston residents.5 Boylston kept records on 5,759 residents who were struck by smallpox and were not inoculated as well as the 282 residents on whom he had performed variolation. At that time, the commonly held view among Boston residents was that variolation ran counter to the will of God, and Boylston's work was met with strong opposition and, occasionally, outright violence.6 Boylston was subsequently arrested and released on the condition that he would not inoculate anyone without governmental permission. However, Boylston's work showed that among the 5,759 residents who were struck by smallpox and were not inoculated, 884 (15.3%) died of smallpox, compared with just six (2.1%) who died from smallpox among the 282 who were inoculated. In July 1726, Boylston presented the results of his work7 at a meeting of the Royal Society chaired by Sir Isaac Newton, representing the very first written record of work that focused on immunization coverage in the American colonies and its association with immunization efficacy.
Benjamin Franklin and assessment of variolation
Benjamin Franklin declared the “incontrovertible success” of variolation during the smallpox outbreaks of 1753–1754 in Boston.8 In that study, 514 (9.3%) of 5,544 people infected with smallpox and not variolated died of smallpox, compared with 30 (1.4%) of 2,113 who were variolated. However, variolation had other drawbacks that included its cost and the labor time lost during the one- to two-month preparation for and recovery from the induced illness. In addition, inoculated individuals posed a clear transmission risk to the rest of the population. As a result of these concerns, every colony except Pennsylvania passed laws to restrict the practice.9
Compulsory variolation and the American Revolutionary War
Those laws would soon be tested during the American Revolutionary War (1775–1783).10 During that war, most colonists were susceptible to smallpox, including recruits in the Continental Army. They faced British troops who were largely immune, as a result of either childhood exposure or army inoculation. The war brought men from diverse geographic locations into crowded camps and then exposed them to civilian populations in their travels, expanding smallpox transmission into vulnerable populations.11 Major military campaigns conducted by the Continental Army were racked by smallpox. During the invasion of Canada beginning in December 1775, American forces conducting a siege of Quebec City while a smallpox epidemic swept through their camp failed to capture the city. In May of 1776, British and Hessian troops arrived to reinforce Quebec City. In the last two weeks of May alone, 1,800 of the 7,000 American troops died from smallpox.12 A subsequent British and Hessian counteroffensive resulted in a rout of the weakened American troops, paving the way for an invasion by British General John Burgoyne's troops. Of the 10,000 troops of American General Horatio Gates' Northern Army that were to defend against the British invasion, 5,500 developed smallpox. Word of smallpox in the Northern Army spread, enlistments ceased, desertions became frequent, and Gates' army began to disintegrate.10
Both the Continental Congress and George Washington realized that preventing smallpox was of paramount importance, and the Continental Congress authorized Washington to order compulsory variolation for every recruit. As a result, by September 1776, the Northern Army was free of smallpox. A few months later, they defeated the British invasion and compelled Burgoyne's forces to surrender at Saratoga.13 This victory and further subsequent successes of the Continental Army have been attributed in part to the fact that the American forces were free of smallpox because of compulsory variolation.10 It would not be until World War I that American troops would be administered intradermal vaccinations for smallpox.14
State compulsory immunization requirements
In 1809, Massachusetts passed the first immunization law in the U.S. requiring smallpox vaccination for the general population, and, subsequently, other states enacted similar legislation.15 Opposition to vaccination in the U.S. grew significantly as states started to enforce their compulsory vaccination requirements. In fact, compulsory vaccination laws were repealed in California, Illinois, Indiana, Minnesota, Utah, West Virginia, and Wisconsin.16 Finally, in 1905 the U.S. Supreme Court upheld the authority of states to pass and enforce compulsory vaccination laws.17 The Court's decision articulated the view that the freedom of the individual must sometimes be subordinated to the common welfare and subjected to the police power of the state. Also, in 1922 the court upheld the constitutionality of a city ordinance requiring smallpox vaccination as a prerequisite for attendance at school.18 State and local laws that mandate vaccinations have been credited with having played a substantial role in improvements in immunization coverage and disease reduction.1922
Typhoid fever and the Spanish American War
The U.S. fought the Spanish American War from April 25 to August 12, 1898, against Spain in support of Cuban independence. During the 10-week war, 243 soldiers were killed in action or died of wounds. However, 1,580 died of typhoid fever.10 Learning from this experience, the U.S. Army commissioned development of a typhoid fever vaccine. The vaccine was successfully developed by 1911, when compulsory vaccination was ordered for all troops and for all service personnel younger than 45 years of age.
The 1918–1919 influenza epidemic
The 1918–1919 influenza epidemic23 remains an ominous warning to current-day public health. In the two decades preceding 1918, the U.S. had experienced influenza epidemics in 1889–1890,24,25 1890–1893,25 and 1916.26 Surveys conducted by the U.S. Public Health Service (PHS) during the 1918 pandemic showed a high incidence of death attributable to influenza among adults aged 20–44 years.27 The deaths in the U.S. civilian population directly attributable to the pandemic were estimated at not less than 450,000, and the estimated death rate of four per 1,000 population was reported to have exceeded even liberal estimates of the preceding epidemics. At the time of the 1918 influenza pandemic, the U.S. was engaged in World War I, and many troops were engaged in brutal trench warfare in Europe. During the war, influenza swept through every camp, causing approximately 25,000 deaths among members of the Army expeditionary forces28 and accounting for approximately 5,000 deaths among the 600,000 men enlisted in the Navy.29 The development of a vaccine for influenza became a U.S. military priority. In 1944, research sponsored by the U.S. Army showed that effective vaccines for influenza A and influenza B could be developed.30,31 In 1946 and 1947, compulsory influenza vaccination for all Army enlistees did not result in lower influenza incidence, an outcome revealing the ability of influenza A to undergo genetic shift.32
The Hagerstown Morbidity Study
On December 1, 1921, the PHS launched the Hagerstown Morbidity Study,33 the first comprehensive study for assessing the incidence of principal causes of illnesses. The study included data from 1,851 white families living in Hagerstown, Maryland, who were recruited using two criteria: (1) representativeness of different economic classes and (2) convenience for repeated visiting. After being recruited for the study, families were canvassed at six- to eight-week intervals for 28 months. Of the top 22 causes of household-reported illnesses in the first published report from the Hagerstown Study, four were illnesses that are considered to be vaccine-preventable diseases today. These included influenza (rank = 2, with 143.2 annual cases per 1,000 people), measles (rank = 8, with 34.2 annual cases per 1,000 people), whooping cough (rank = 9, with 22.6 annual cases per 1,000 people), and chickenpox (rank = 13, with 13.9 annual cases per 1,000 people). However, vaccines for those diseases had not yet been developed. Subsequent publications from the Hagerstown Morbidity Study included reports on notifiable diseases,34 the use of medical and hospital services,35 the association between age and illness,3638 a comparison of the incidence of illness and death by cause and age,39 differences in illness rates by gender,40,41 and the association between poverty and illness.42 Because of the scope and depth of the public health topics covered, the Hagerstown Morbidity Study has been considered to be the precursor to the National Health Interview Survey (NHIS).43
The U.S. Morbidity Study
Subsequent to the Hagerstown Morbidity Study, the PHS conducted a second study between 1928 and 1931 that used the methodology of the Hagerstown study, but expanded its scope to observe 8,758 white families for 12 consecutive months in 130 localities in 18 states. This study came to be known as the U.S. Morbidity Study.44 The U.S. Morbidity Study collected health outcomes similar to those collected by the Hagerstown Morbidity Study. For the first time in the history of public health surveillance in the United States, the U.S. Morbidity Study collected vaccination histories of family members in surveyed households, although a federal program to support immunization activities had not yet been developed.45 Those histories were household-reported and not verified by vaccination providers, and included family members' histories for the four vaccines in use at that time: smallpox, diphtheria, typhoid fever, and scarlet fever vaccines.4649 Analyses included in the published reports described how vaccination coverage varied according to age; gender; marital status; city size; U.S. region; family income; and metropolitan, urban, and rural designations. Results from the survey showed that from 1928 to 1931, vaccination coverage among study participants across all age groups, and with no history of vaccine-specific disease, was 54.4% for smallpox, 15.8% for diphtheria, 7.5% for typhoid fever, and 2.0% for scarlet fever. For children younger than 15 years of age with no history of vaccine-specific disease, vaccination coverage rates were 40.9% for smallpox, 31.8% for diphtheria, 4.9% for typhoid fever, and 2.8% for scarlet fever.
The 1936 PHS study
In 1936, the PHS conducted a survey with a similar study design to the Hagerstown Morbidity Study. In the 1936 study, the PHS obtained information from 213,931 families in 28 cities of 100,000 population or more, located in 19 states. However, information was collected from white and black families, and families that were classified as belonging to an “other” race category. A total of 761,968 people were in the families canvassed, including 182,640 children younger than 15 years of age at the time of the survey. For each person younger than 25 years of age, data were recorded on the individual's history of an episode of the disease or immunization against smallpox, diphtheria, scarlet fever, and typhoid fever at any time since birth. Results showed that among children younger than 15 years of age, vaccination coverage rates were 62.7% for smallpox, 48.0% for diphtheria, 1.7% for typhoid fever, and 1.9% for scarlet fever.
The 1941 study of parents' attitudes toward immunizations
In 1941, with the U.S. on the verge of entering World War II, it was recognized that wars increased the hazard of spreading communicable diseases among not only the troops, but also the general population.50 Immunization was compulsory in the armed forces, but not among civilians. Public immunization would prevent epidemics and preserve the civilian workforce that was needed to support the war effort.
In September 1941, a national survey examined the public's attitudes toward immunizations to learn whether the public was ready for compulsory immunizations.50 The study showed that while the public was aware of the value of immunization and saw no specific drawbacks to being immunized, only slightly more than 50% of those in need of protection said that they might be willing to be immunized. Further, the study revealed that the public was not well-informed about when or how often to be immunized. People responsible for children were generally better informed concerning immunization procedures than adults not responsible for children.
Polio in the U.S.
The U.S. polio epidemic had a profound impact on the development of vaccines and the acceptance of universal vaccination by the American public.51 The first documented outbreak of polio describes a cluster of eight to 10 cases of infantile paralysis in West Feliciana, Louisiana, in 1841.52 Subsequent small outbreaks5356 in the U.S. were followed by an outbreak in New York City in 1907, where an estimated 2,500 cases and 125 deaths were recorded. Thereafter, surveillance of polio cases became routine for the PHS.5760
From the early 1940s to 1952, annual incidence rates of polio surged61,62 and the American public became terrified63 by outbreaks that occurred in urban and rural areas throughout the U.S.61 In 1954, the Salk poliomyelitis vaccine was field-tested. During the inoculation phase of the field test, approximately 400,000 second-grade children in 44 states were vaccinated. In 1955, the vaccine was declared to be safe and effective,64,65 and three doses were recommended for routine administration. Also, in that year President Eisenhower signed the Polio Vaccine Assistance Act into law, marking the first time the U.S. government became involved in civilian immunization activities by allowing federal grants to states for the purchase of polio vaccine, for the costs of planning and conducting vaccination programs,45 and for vaccination coverage assessment surveys to evaluate immunization needs.66 However, for a brief period in 1955, the recommendation for routine polio administration was suspended because of contamination of 120,000 doses with live poliovirus that led to 40,000 cases of abortive poliomyelitis, 56 cases of paralytic poliomyelitis, and five deaths.67,68
Despite the temporary setback, when the suspension was lifted and routine administration was reinstated, an estimated six million children were reported to have been vaccinated by July 1955.68 As the nationwide mass vaccination campaign progressed, the incidence rate of polio decreased quickly and dramatically. Attitudes and beliefs related to being vaccinated with the poliomyelitis vaccine were studied in California69 and Georgia,70 and the findings of several published and unpublished studies were analyzed in a systematic review of the existing literature.71
Surveillance of poliomyelitis vaccination coverage
At first, the PHS attempted to estimate poliomyelitis uptake by using information provided by manufacturers' records of domestic vaccine shipments, monthly state reports covering vaccine purchases with federal funds, and other reports submitted by states to the PHS. However, estimates of overall vaccination participation based on these reports provided little information on receipt of vaccines by age and number of inoculations received per person.
In the summer of 1957, the PHS contracted with the Bureau of the Census to add supplemental questions on poliomyelitis vaccination participation to the Current Population Survey.66 In 1958, this survey became known as the U.S. Immunization Survey (USIS). Conducted annually, the USIS used household-reported vaccination histories to estimate national vaccination coverage rates. Details of the distribution and use of poliovirus vaccines in the U.S. can be found in the Communicable Disease Center's reports entitled Poliomyelitis Surveillance Report, in which the initial reports of vaccination coverage were published for selected years,7275 and in the annual reports entitled United States Immunization Survey7686 (for publication years 1967–1978). Although the USIS was conducted annually up to and including 1985, no annual reports were routinely published from data collected between 1979 and 1985 by the Centers for Disease Control (renamed the Centers for Disease Control and Prevention [CDC] in 1992), although retrospective reports on estimated coverage from USIS data were published.87,88
From 1955 to 1961, the estimated percentage of the U.S. civilian population that had received ≥3 doses of poliomyelitis vaccine reached 53.6%,66 and the number of annual poliomyelitis cases (all types) declined from 28,985 to 1,327 nationally.89 Over time, the USIS expanded vaccination coverage surveillance to new vaccines as they became recommended. In 1978, vaccination coverage estimates were published for children aged 1–4 years for each year between 1965 and 197886 and included vaccination coverage estimates for rubella, measles, diphtheria-tetanus-pertussis, poliomyelitis, influenza, and mumps vaccines.
A hiatus in federal vaccination coverage assessment, disease resurgence, and the Vaccines for Children (VFC) program
From 1986 to 1991, there was a hiatus in vaccination coverage assessment activities conducted by the U.S. government. During that time, there was a resurgence in the number of measles,90,91 mumps,92 and rubella93 cases in the U.S. Research revealed that cases observed during the measles resurgence were disproportionately inner-city, preschool-aged, American Indian, Hispanic, or black children <5 years of age who had not been vaccinated9497 and who were living in poverty.91 Data from retrospective immunization coverage surveys of children entering kindergarten or first grade in the 1990–1991 and 1991–1992 school years showed that vaccination levels of preschool- and school-aged children were low.98 In response to this resurgence, the Childhood Immunization Initiative99,100 was developed in 1993 to eliminate significant gaps in vaccination coverage among young children in the U.S. Among the strategies for achieving this goal was eliminating the cost of vaccines as a barrier to being vaccinated. In October 1994, the Vaccines for Children (VFC) program101 was established to achieve this goal by providing financially vulnerable children with publicly purchased vaccines at no cost at the offices and clinics of vaccination providers who are enrolled in the VFC program.
Recommencement of federal vaccination coverage assessment
In 1991, CDC recommenced assessment of national vaccination coverage in the U.S. using the NHIS.102 From 1991 to 1993, household-reported vaccination histories were collected for children aged <6 years in sampled households; between 1994 and 1999, the household used vaccination provider-reported vaccination histories from sampled children.103 Data from the 1992 NHIS provided estimates for the first published reports of national vaccination coverage that followed the measles, mumps, and rubella resurgence.104
The National Immunization Survey (NIS) and the NIS-Teen
In 1994, CDC launched the NIS, which has since been conducted annually to date. The NIS was originally designed to obtain accurate and precise estimates of vaccination coverage in states and local areas that were affected the most by the resurgence. The NIS is a landline telephone survey of households with children aged 19–35 months.105107 Among households for which consent is obtained, a mail survey is sent to vaccination providers to obtain sampled children's provider-reported vaccination histories that are used to estimate vaccination coverage rates. Currently, the NIS collects provider-reported vaccination histories for the following vaccines: diphtheria-tetanus-acellular pertussis (DTaP), polio, measles-mumps-rubella (MMR), hepatitis B (Hep B), Haemophilus influenzae type b (Hib), varicella (VAR), heptavalent and 13-valent pneumococcal conjugate (PCV7 and PCV13), hepatitis A (Hep A), seasonal influenza, and rotavirus. In 2009, data from a completed telephone interview and an adequately reported provider-reported vaccination history were obtained for 17,313 children aged 19–35 months.
From 2005 to 2007, three new vaccines were recommended for adolescents. In response, CDC initiated the NIS-Teen in 2006. The design of the NIS-Teen is similar to that of the NIS: a landline telephone survey of households with adolescents aged 13–17 years is followed by a mail survey sent to vaccination providers to obtain sampled adolescents' provider-reported vaccination histories when consent is obtained to contact providers.108 Currently, the NIS-Teen collects provider-reported coverage histories for the following: (1) vaccines that are recommended beginning at 11 years of age—tetanus-diphtheria-pertussis (Tdap), quadrivalent human papillomavirus (HPV4), and meningococcal conjugate (MCV4); the seasonal influenza vaccine that is recommended annually; vaccines for which catch-up doses are recommended—Hep B, inactivated poliovirus, MMR, and VAR; and vaccines recommended to certain high-risk groups—Hep A and pneumococcal conjugate. In 2009, data from a completed telephone interview and an adequately reported provider-reported vaccination history were obtained for 20,399 adolescents aged 11–17 years. Data from the NIS109,110 and NIS-Teen111,112 continue to be used to obtain routine annual reports on progress in national- and state-level vaccination coverage.
Both the NIS and NIS-Teen surveys are based on sampling households with landline telephones. In recent years, the number of households that use only cellular telephone service has increased dramatically.113 However, recent studies suggest that bias in surveys that only sample households with landline telephones may be small.114116 CDC is currently experimenting with contacting homes that use cellular telephones to improve the coverage of the target populations of the NIS and NIS-Teen.
Recent assessment of adult vaccination coverage in the U.S.
The NHIS has been one of the main surveys used to assess national estimates of adult vaccination coverage. In 1989, an immunization supplement to the NHIS collected self-reported vaccination status for the seasonal influenza, pneumococcal, and tetanus vaccines.117 In 2000, the NHIS again began collecting information annually on adult influenza and pneumococcal vaccinations. In 2009, the NHIS118 collected self-reported adult vaccination histories for seasonal influenza, pneumococcal, tetanus (with reduced diphtheria [Td] and without), Hep A, Hep B, herpes zoster, and HPV4 vaccines.
The Behavioral Risk Factor Surveillance System (BRFSS) is a cross-sectional telephone survey conducted by state health departments with technical and methodological assistance from CDC.119 Conducted annually since 1993, the BRFSS has collected self-reported adult vaccination histories for the seasonal influenza and pneumococcal vaccines.120 Currently, CDC supports optional modules that states can use to assess Td/Tdap, herpes zoster, and HPV4 vaccinations among adults and influenza vaccination among children.
CDC conducted the National Adult Immunization Survey (NAIS) in 2003 and 2007 to gather timely data on newly licensed vaccinations. Data from the NAIS were used to examine racial/ethnic differences in seasonal influenza and pneumococcal vaccination coverage among adults aged ≥65 years;121 evaluate behavior and beliefs about influenza vaccine among adults aged 50–64 years;122 track uptake of herpes zoster vaccination among adults aged ≥60 years123 and Hep A vaccination coverage among adults aged 18–49 years;124 and learn about HPV4 awareness and vaccination initiation among women.125
Evaluation of influenza A (H1N1) vaccination coverage
The National 2009 H1N1 Flu Survey (NHFS) was conducted to provide weekly estimates of influenza A (H1N1) monovalent vaccination coverage. To estimate national- and state-level influenza vaccination coverage from August 2009 to May 2010, CDC combined data from the BRFSS and the 2009 NHFS. Interim reports that gave national126 and state127 estimates have been published along with final national estimates.128 Final estimates using combined data from the NHFS and BRFSS showed that 2009–2010 seasonal influenza vaccination coverage among all people aged ≥6 months in the U.S. was 41.2% (95% confidence interval 40.8, 41.6).
Since 1986, the Healthcare Infection Control Practices Advisory Committee and the Advisory Committee on Immunization Practices (ACIP) have recommended that all health-care personnel be vaccinated annually for influenza.129,130 To evaluate this recommendation, a population-based panel survey was administered via the Internet during January 2010 to a nationally representative sample of health-care personnel. The survey showed that estimated H1N1 coverage for this group was 37.1%.131 Also, because pregnant women are at increased risk for severe disease associated with influenza infection, the American College of Obstetricians and Gynecologists and ACIP have recommended seasonal influenza vaccination for women while pregnant, regardless of trimester.132,133 Self-reported H1N1 status from pregnant women in 10 states showed that estimated H1N1 coverage for this group was 46.6%.134 In 2010 and 2011, provider-reported H1N1 vaccination status for children aged six months through 17 years has been collected in the NIS and NIS-Teen.
Local area approaches for assessing vaccination coverage
Although the NIS and the NIS-Teen provide national and state estimates of vaccination coverage that are useful for assessing state immunization program performance and achievement of national coverage objectives, assessing vaccination coverage in smaller geographic areas can pinpoint where coverage is low. Targeted interventions may be designed to increase coverage in those areas. A wide variety of methods have been used in the past to obtain coverage estimates in smaller locales.88,135137 In the U.S., each state has immunization requirements, sometimes called “school laws,” that must be met before a child may enter school. In most states, a parent must bring written proof of a child's immunizations from the health provider or clinic at the time of school registration. State-based school surveys have been conducted regularly to assess vaccination coverage at school entry as well as the percentage of school-entry children whose parents take an exemption from the mandatory state immunization requirements.138141 Also, state-based Immunization Information Systems, also known as immunization registries,142146 are used to assess childhood vaccination coverage within states.
The number of cases of most vaccine-preventable diseases is at an all-time low,147 and hospitalizations and deaths from these diseases have also shown striking decreases. Our national vaccine recommendations in the U.S. target an increasing number of vaccine-preventable diseases for reduction, elimination, or eradication.148 This success has been achieved at least in part because vaccination coverage among young children in the U.S. has reached record highs with estimated national coverage that exceeds 90% for many recommended vaccines.110 Achievement of this success has been due in part to the assessment of vaccination coverage. Assessment enables vaccination program managers to learn the extent to which their efforts have achieved vaccination coverage goals and to implement interventions or change policies to improve coverage. Also, assessment is an essential component in evaluating vaccine effectiveness, examining the relationship between increased coverage and population disease burden, monitoring vaccine safety, and studying public perceptions about vaccines.
Across the U.S., both the rich and poor149 live with little concern for many infectious diseases because of the great effort and sacrifice that has been made to develop and implement vaccination programs.150 For the first time in the history of mankind, there is a nation where there is freedom from the fear of illness or death from what were formerly endemic killer diseases. Maintenance of that freedom depends, in part, on remembering what has gone before us, removing the barriers that remain in affording access to safe and effective vaccines for all people, using science to discover ways to prevent other diseases we have not yet conquered, and remaining diligent about knowing where we are through continued assessment of how well the nation is protected from vaccine-preventable diseases.
Acknowledgments
The authors gratefully acknowledge the work of Pamela A. Martin, Jack F. Colbert, and Katherine L. Tucker at the Centers for Disease Control and Prevention's Public Health Library and Information Center; and Naomi House and Jennifer A. Turley at the U.S. Census Bureau, who labored to provide citations for many of the original data sources. Also, the authors thank David J. Sencer, James A. Singleton, Peng-Jun Lu, Tammy A. Santibanez, Amanda Bryant, Karen Cullen, Cindi Knighton, Bob Chen, and Gary Euler for guiding the authors to recent publications that document progress in vaccination coverage.
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