Testimony
Before
the Committee on Health, Education, Labor and Pensions
United
States Senate
Responding
to the Challenges of the 21st Century: CDC's
National Immunization Program
Statement
of
Walter
A. Orenstein, M.D.
Director
National
Immunization Program,
Centers
for Disease Control and Prevention,
Department
of Health and Human Services
For
Release on Delivery
Expected
at 10:00 am
on
Tuesday, November 27, 2001
Good
morning Mr. Chairman and members of the Committee. My
name is Walter A. Orenstein, M.D., Director of the National
Immunization Program (NIP), Centers for Disease Control
and Prevention (CDC). I'm pleased to be here today to
speak about the benefits achieved through widespread immunization
and the public health challenges the immunization program
faces in the 21st century.
Today's
hearing asks if the National Immunization Program is ready
for the 21st Century. I am here to tell you
that we made significant advances at the end of the 20th
Century, and are well poised to face the challenges of
the 21st. Challenges remain, however, as I
will outline in my testimony and the National Immunization
Program looks forward to working with the Committee to
ensure that we meet these challenges.
Let
me begin by thanking the Committee for its support of
immunizations. Some of the successes I will discuss are
due to that support. As a result of our immunization program,
millions of children have been vaccinated, millions of
cases of disease, disability and death have been averted,
and billions of dollars have been saved. I would like
to discuss some of these achievements and discuss future
challenges.
IMMUNIZATION
ACHIEVEMENTS
Immunization
has been cited as one of ten top public health achievements
of the 20th century. (See Appendix 1). Smallpox
has been eradicated as a naturally occurring disease and
we are nearer than ever to achieving worldwide eradication
of polio. The number of measles cases in the U.S. is at
a near record low, measles is no longer endemic in the
U.S., and we are close to the interruption of measles
transmission in the entire Western Hemisphere. And, in
a few short years since the licensing of a vaccine, chickenpox
cases and accompanying hospitalizations have been dramatically
reduced. Furthermore, since October, 1994, the Vaccines
for Children (VFC) program has been providing publicly
purchased vaccine to eligible children at no charge to
both public and private providers. By eliminating vaccine
cost as a barrier to immunizing children eligible for
VFC, children can now be vaccinated in their medical home,
(i.e., their doctor's office) instead of having to make
an extra visit to a health department clinic for free
vaccines.
We
have made outstanding progress in increasing the U.S.
immunization rate in children by the time they are 2 years
of age. Coverage for most vaccines is 90 percent or higher.
(See Appendix 2). However, despite these gains, every
day in the U.S., 11,000 babies are born who must be vaccinated.
To be protected against 11 vaccine-preventable diseases
(See Appendix 3), they require 16-20 doses or injections
by 2 years of age, a challenge for any health care delivery
system. Recent small, but significant, decreases in coverage
for some vaccines indicate we cannot take for granted
that past successes will automatically translate into
future successes. Thus, we must commit to sustaining and
improving our immunization system.
We
are also working to improve immunization of our adult
population. The loss of life and costs from adult vaccine-preventable
diseases are staggering. Each year, about 30,000 adults
die from complications of influenza, pneumococcal disease,
and hepatitis B, diseases preventable by vaccination.
Influenza and pneumococcal immunization rates for adults
65 years of age and older, while increasing, are still
well below 90 percent coverage goals.
Record
or Near Record Lows in Vaccine-Preventable Diseases and
High Vaccination Coverage in Two Year
Old Children
Annual
reported cases of diphtheria, measles, mumps, rubella,
congenital rubella syndrome, and Haemophilus influenzae
type b (Hib) have been reduced by over 99 percent
from prevaccine-era levels during the 20th century. The
last case of indigenously acquired wild polio in the United
States occurred in 1979, and many other childhood diseases
are currently at record or near-record lows.
We
have achieved these record or near-record low levels of
childhood disease by having high levels of childhood vaccination
coverage. Immunization levels for most individual vaccines
such as measles, polio, Hib, hepatitis B and 3 doses of
diphtheria-tetanus-acellular pertussis (DTaP) are at 90
percent or higher. To put recent improvements for vaccination
in perspective, in 1991, only 37 percent of the nation's
children received a combined series of four doses of DTP
containing vaccine, three doses of polio vaccine, and
one dose of measles-mumps-rubella (MMR) vaccine, also
known as the 4:3:1 series. For 2000, the coverage level
for the 4:3:1:3 series, which also includes three doses
of the Haemophilus influenzae type b (Hib) vaccine,
was 76 percent.
Disparities
in immunization coverage rates between racial and ethnic
groups have also been reduced. In 1970, the measles immunization
rate for racial and ethnic minority children was 18 percentage
points lower than the rate for white children. In 2000,
the gap between white, non-Hispanic children, Hispanic
children, and black children was less than 4 percentage
points. Disparities among these three groups in coverage
of Hib, hepatitis B, polio, and varicella vaccines were
four percentage points or less in 2000. However, in 2000,
significant disparities existed between racial and ethnic
groups for the 4:3:1:3 series, indicating more could be
done.
Despite
significant improvements between 1999 and 2000 in coverage
for hepatitis B and varicella vaccines, there have been
some slight but statistically significant decreases in
coverage for the combined 4:3:1:3 series of 2 percent.
This decrease is a warning that we cannot take high immunization
coverage levels for granted.
Elimination
of Endemic Measles in the U.S. and the
Americas
Because
of the widespread use of measles vaccine, measles is no
longer an endemic disease in the United States. All cases
today represent importations with limited domestic spread.
Over the past decade, we have dramatically increased first
dose coverage among preschool children and we have provided
a second dose for the majority of school children. Before
1985, measles coverage for 2-year old children never reached
more than 70 percent. The U.S. experienced a resurgence
of measles in 1989-1991, with more than 55,000 cases and
11,000 hospitalizations reported, resulting in 123 measles-associated
deaths. In 1990 alone, more than 27,000 cases of measles
were reported. We have made great progress since then:
in 2000, fewer than 100 cases were reported.
Even
though we have eliminated endemic measles, importations
will continue to occur while measles is endemic in other
countries. We have supported other countries in their
fight against measles and this has helped to reduce the
number of internationally imported cases from over 300
in 1990 to an average of less than 50 imported cases per
year in the last five years. CDC is the leading technical
and donor partner with the Pan American Health Organization,
whose leadership has reduced measles cases in the Americas
by >99 percent from about 250,000 in 1990 to <500
in 2001. Nevertheless, because measles importations from
around the world continue to occur, there is a potential
for measles epidemics to recur in the United States unless
high immunization coverage is maintained for each new
cohort of approximately 4 million children, born annually.
Reduction
in Varicella (Chickenpox) Cases and Hospitalizations
Prior
to the availability of varicella (chickenpox) vaccine,
there were approximately 4 million cases a year in the
U.S. Although varicella is frequently perceived as a disease
that does not cause serious illness, many are not aware
that an average of 11,000 hospitalizations and 100 deaths
occurred per year in the United States before varicella
vaccine became available. The majority of deaths and complications
occurred in previously healthy individuals.
Varicella
vaccine was licensed in 1995 and CDC contracted for this
vaccine and began distribution in 1996. From the time
of vaccine licensure, CDC conducted active surveillance
for varicella cases in three areas in the United States:
Antelope Valley, CA.; Travis County, TX; and West Philadelphia,
PA. Between 1995 and 2000, there was a 78 percent decline
in the number of reported varicella cases in these sentinel
sites and a 65 percent decrease in hospitalizations.
Adult
Immunization Coverage Rates Continue to Improve
The
impact of vaccine-preventable diseases in adults in the
U.S. is staggering. Fortunately vaccines can protect adults
from influenza, as well as many other potentially debilitating
diseases, such as pneumococcal disease and hepatitis B.
While progress is being made in immunizing the adult population
against these diseases, some improvements could help us
meet our public health goals.
- By
1999, among persons >65 years of age, vaccination
levels approached or exceeded the 60 percent national
Healthy People 2000 objective in all states for influenza
vaccination, and in 24 states for pneumococcal vaccination.
- In
2000, among persons >65 years of age, 64 percent
reported having received influenza vaccine in the previous
year, and 53 percent reported having ever received pneumococcal
vaccine, as compared to 33 percent and 15 percent, respectively,
in 1989.
Despite
these gains, we still have not reached our goal for 2010
of 90 percent vaccination coverage for influenza and pneumococcal
vaccines.
Achieving
Global Polio Eradication
Extraordinary
progress has been made toward global polio eradication.
In 1988, polio existed in over 125 countries on five continents.
As of 2001, polio was detected in just 11 countries. Global
polio incidence has declined by more than 99 percent from
about 350,000 cases in 1988 to less than 3,000 in 2000.
Type 2 wild poliovirus (one of three types of poliovirus)
has not been detected since 1999 and may have already
been eradicated.
IMMUNIZATION
CHALLENGES
It
is currently recommended that all children be vaccinated
against 11 diseases and that many adults receive influenza,
pneumococcal, and hepatitis B vaccines. This requires
that adequate supplies are available to meet the needs
of all those children and adults and that there is a vaccine
financing, distribution, and administration system to
provide 16-20 doses of vaccines to children by age 2,
an additional 4 doses later in childhood, and a system
to identify and vaccinate adults in need. Although substantial
progress has been made, the current immunization program
still faces some challenges.
Fragility
of the Vaccine Supply
One
of the most critical challenges is addressing the fragility
of the vaccine supply. The nation is experiencing shortages
of vaccines against four of the eleven diseases preventable
through routine vaccination of children: diphtheria, tetanus,
pertussis, and pneumococcal disease, and delays in vaccine
availability for influenza vaccine which is recommended
for many adults and children. Today's supply problems
are multifactorial, complex, and vary from vaccine to
vaccine and manufacturer to manufacturer. The issues now
include manufacturer withdrawal from the market, difficulty
in complying with Good Manufacturing Practices established
by the Food and Drug Administration, and insufficient
stockpiles of vaccines to be used to mitigate the impact
of any transient supply disruptions. We appreciate your
concern with vaccine shortages and believe that your request
of the General Accounting Office to study these issues
will be useful to better understand the problems and identify
solutions. We are cooperating with the GAO and look forward
to their report.
Addressing
these shortages has been challenging. CDC has taken action
to help ameliorate problems associated with the vaccine
supply by: (1) changing vaccination schedules to reduce
the number of doses from optimal protection to what can
be managed given limited vaccine supplies, (2) monitoring
the manufacturers' production and release of vaccines
through voluntary communications, and (3) managing as
best as possible the purchase, ordering, and distribution
of vaccines purchased by states through the federal contracts
to facilitate equitable distribution of the limited supplies.
For
the longer term, we are working closely with the National
Vaccine Advisory Committee to evaluate the reasons for
the current supply problems and recommend solutions to
prevent vaccine shortages.
Since
1983, CDC has been operating stockpiles of certain vaccines.
These stockpiles are used to address short-term disruptions
in the production of universally recommended vaccines.
There
have been a number of instances when stockpiles were needed.
Most withdrawals from the stockpiles have been made by
manufacturers to address unanticipated vaccine production
problems. For example, in 1986, the measles-mumps-rubella
(MMR) stockpile was used to assure a continuous supply
of vaccine after a fire in a manufacturing plant. In 1990,
a polio vaccine stockpile was used to temporarily supply
vaccine when a manufacturer experienced a delay in product
release.
CDC
has limited current stockpiles of vaccines to those produced
by a single manufacturer for which there is a stable demand,
(e.g., vaccines used for 90 percent or more of children
over the years). However, the shortage of a vaccine such
as DTaP, which was made by 4 manufacturers until January,
2001, when two of these manufacturers dropped out of the
market, has led CDC to reevaluate what vaccines should
be stockpiled. We expect this re-evaluation to be completed
in the next few months.
Vaccine
Financing
Another
important aspect of assuring vaccine availability is that
of vaccine financing.
Financing
for immunizations is frequently (though not always) provided
through employment-based and other private purchase insurance,
the Vaccines for Children (VFC) program, the State Children's
Health Insurance Program (SCHIP), and Medicare. Yet while
these private and public health insurance programs account
for the majority of immunizations provided nationally,
they do not offer the U.S. population seamless and universal
coverage. The federal Section 317 categorical grant program
and state vaccine purchase programs address residual needs
and serve as an important safety net in reducing gaps
and uncertainties in these health financing plans. Specifically,
the Section 317 and state vaccine purchase programs focus
particularly on providing vaccines for children who have
health insurance but whose insurance either does not cover
immunization or has large deductibles, children who are
considered "underinsured."
Due
to advances in biotechnology and vaccine safety, the number
of routinely recommended vaccines has been expanded to
control newly-preventable diseases, and the composition
of some vaccines has been changed to provide the safest
vaccines possible. The Advisory Committee on Immunization
Practices (ACIP) continually makes new recommendations
to the vaccine schedule to further protect the health
of our nation's children. These recommendations for routine
use of additional vaccines to prevent disease result in
increased vaccine purchase costs for the immunization
program. The cost, using the CDC contract, of purchasing
the vaccines to fully vaccinate a preschool child has
increased from approximately $130/child in 1990 to approximately
$394/child in 2001. For example, the cost of the new pneumococcal
conjugate vaccine is about equivalent to the total combined
costs of all other pediatric vaccines in the recommended
schedule.
CDC
is working to address these challenges. In September 2001,
CDC awarded a contract to the Institute of Medicine (IOM)
to develop a study on vaccine financing in the U.S. This
study will examine federal and state budgets for the public
vaccine supply and consider other finance mechanisms that
might be helpful to improve vaccine availability, such
as increased coverage for vaccines in private insurance
plans. Among the issues the IOM will address are the roles
of public (federal, state, and local) and private (health
plans, health insurers, and purchasers) agencies in financing
the purchase and administrative costs of vaccines in the
United States. A report is expected by April, 2003.
Developing
state and local community-based Infrastructure
Any
effective immunization program should have two major components,
and should be complementary to other existing public and
private immunization programs. First, vaccine must be
available. Second, a vaccine infrastructure should be
in place to assure the vaccine is appropriately distributed,
physicians and nurses are trained to administer the vaccine
properly, adequate staffing is available to provide vaccines
in clinics at convenient hours, outbreaks are detected
and controlled, individuals are found and communities
identified that are not adequately vaccinated and measures
initiated to immunize them, and a host of other functions.
As
additional vaccines are licensed which can reduce vaccine
preventable diseases, additional burdens are placed on
the State and local health departments to provide more
immunization services to broader populations. Diverse
populations require targeted outreach and educational
activities which can be provided by state and local health
departments. For example, existing linkages between the
U.S. Department of Agriculture's Special Supplemental
Nutrition Program for Women, Infants, and Children (WIC)
and State and local immunization programs can enhance
immunization coverage levels. In addition, State programs
to train providers in vaccine
handling
and administration are an important part of immunization
programs. The IOM highlighted the need for improved immunization
infrastructure and called for increased funding in their
report "Calling the Shots, Immunization Finance Policies
and Practices."
The
additional $42.5 million dollars appropriated by Congress
in FY 2001 was awarded by CDC to all States, through our
grant program, to assist them in improving immunization
service administration, developing state-based immunization
registries, improving linkages with WIC programs (which
serve many children at high risk of being underimmunized),
and providing public and professional information and
education, among other activities.
The
Vaccine Safety Challenge
Immunizations
are subject to a higher standard of safety than other
medical interventions because they are given to healthy
people. Like all medical interventions, no vaccine is
100 percent safe or effective. Vaccine safety activities
are needed to maintain public confidence in immunizations,
preserve high coverage levels, and prevent a resurgence
of vaccine-preventable diseases. The tremendous reduction
in the occurrence of vaccine-preventable diseases, combined
with the increased public attention on vaccine safety
concerns, has resulted in some individuals questioning
the important public health role of immunizations. To
maintain confidence in immunizations, we must have a better
understanding of which risks are truly attributable to
vaccines, the magnitude of the risks, the groups at greatest
risk of adverse events, the pathophysiology of adverse
events, and the ability to effectively evaluate and treat
adverse events. CDC has developed several projects to
help address these needs. One project is a newly-funded
Clinical Immunization Safety Assessment (CISA) network
to assess individuals with selected adverse events and
offer recommendations for management. CDC also funds a
Vaccine Safety Datalink (VSD) project which collects population-based
data on vaccine safety by utilizing medical care data
from 8 managed care organizations around the United States.
This system helps in determining whether adverse events
following vaccination are causally related or are coincidentally
related. Finally, CDC and NIH have contracted with the
Institute of Medicine to provide independent review of
emerging information concerning adverse events associated
with vaccines. These reviews will address whether the
available evidence supports a role for vaccine in causing
the adverse event and recommendations for future research
and public health actions.
Continuing
Challenges to Improving Adult Immunization
Most
domestic vaccine-preventable disease morbidity and mortality
occurs among adults, primarily resulting from complications
associated with influenza, pneumococcal disease, and hepatitis
B infections. An annual average of approximately 20,000
deaths and 110,000 pneumonia and influenza hospitalizations
result from influenza infections. In recent years, approximately
6,000 deaths and over 45,000 severe cases of pneumococcal
disease have occurred among adults in the U.S. Despite
availability of a highly effective vaccine, approximately
80,000 persons, mostly adolescents and young adults, are
infected with hepatitis B virus annually in the U.S. About
5,000 of these newly-infected persons are hospitalized,
and 5,000 become chronically infected. An estimated 1.25
million persons in the U.S. have chronic hepatitis B infection,
facing a 15 percent-25 percent risk of dying from chronic
liver disease or hepatocellular carcinoma and serving
as a reservoir for continued hepatitis B transmission.
Annually, about 4,000 to 5,000 of those chronically infected
die.
Despite
recent improvements I noted earlier, vaccination coverage
levels among adults for whom CDC recommends vaccination
are still very low compared to levels achieved among children,
and compared to the Healthy People 2010 objectives for
influenza and pneumococcal vaccination (90 percent for
those aged 65 and 60 percent for those aged 18-64 at high
risk).
The
immunization delivery system for adults is quite different
from the system for children. The great majority of vaccines
for adults are purchased and administered in the private
sector. The major role for the public sector is to work
with private providers to improve vaccination coverage
of their patients and to promote immunizations among the
general public. However, little public health infrastructure
exists to assure adequate vaccination of adults. Targeting
vaccination efforts requires an infrastructure to organize
immunization providers, strategically convert non-vaccinating
providers into vaccinating providers, and change practice
behavior of existing providers.
Global
Immunization Challenges
Each
year, diseases that could be prevented with available
vaccine kill 3 million children worldwide. Almost 2 million
additional deaths could be prevented by vaccines now in
late stages of development. The remaining challenges include:
1) ensuring adequate financial resources from all sources,
including both public and private sources to complete
polio eradication; 2) ensuring support for translating
the success in achieving measles elimination in the Americas
to implement a global initiative to prevent the approximately
800,000 childhood deaths worldwide caused by measles each
year; and 3) support for the Global Alliance for Vaccines
and Immunization goals to improve routine immunization
services in developing countries and introduce new and
underutilized vaccines such as hepatitis B and Haemophilus
influenzae type b (meningitis) vaccine.
Conclusion
Thank
you Mr. Chairman and members of the Committee for providing
the opportunity to appear before you. The immunization
program has achieved a remarkable record of success. But,
our effective vaccines can only be as good as our ability
to deliver them to children and adults in need. By continuing
to improve the system, we as a society, and we as individuals,
can gain the full benefits vaccines have to offer.
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