Principles of Vaccination
Epidemiology and Prevention of Vaccine-Preventable Diseases
The Pink Book: Course Textbook - 12th Edition Second Printing (May 2012)
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Immunology of Vaccine-Preventable Diseases
Immunology is a complicated subject, and a detailed discussion of it is beyond the scope of this text. However, an understanding of the basic function of the immune system is useful in order to understand both how vaccines work and the basis of recommendations for their use. The description that follows is simplified. Many excellent immunology textbooks are available to provide additional detail.
Principles of Vaccination
- Self vs. nonself
- Protection from infectious diseases
- Usually indicated by the presence of antibody
- Very specific to a single organism
- Protection produced by the person's own immune system
- Usually permanent
- Protection transferred from another human or animal
- Temporary protection that wanes with time
Immunity is the ability of the human body to tolerate the
presence of material indigenous to the body ("self"), and to
eliminate foreign ("nonself") material. This discriminatory
ability provides protection from infectious disease, since
most microbes are identified as foreign by the immune
system. Immunity to a microbe is usually indicated by the
presence of antibody to that organism. Immunity is generally
specific to a single organism or group of closely related
organisms. There are two basic mechanisms for acquiring
immunity, active and passive.
Active immunity is protection that is produced by the
person’s own immune system. This type of immunity is
Passive immunity is protection by products produced by
an animal or human and transferred to another human,
usually by injection. Passive immunity often provides effective
protection, but this protection wanes (disappears) with time, usually within a few weeks or months.
The immune system is a complex system of interacting cells whose primary purpose is to identify foreign ("nonself") substances referred to as antigens. Antigens can be either live (such as viruses and bacteria) or inactivated. The immune system develops a defense against the antigen. This defense is known as the immune response and usually involves the production of protein molecules by B lymphocytes, called antibodies (or immunoglobulins), and of specific cells (also known as cell-mediated immunity) whose purpose is to facilitate the elimination of foreign substances.
Principles of Vaccination
- A live or inactivated substance (e.g., protein, polysaccharide) capable of producing an immune response
- Protein molecules (immunoglobulin) produced by B lymphocytes to help eliminate an antigen
The most effective immune responses are generally produced in response to a live antigen. However, an antigen does not necessarily have to be alive, as occurs with infection with a virus or bacterium, to produce an immune response. Some proteins, such as hepatitis B surface antigen, are easily recognized by the immune system. Other material, such as polysaccharide (long chains of sugar molecules that make up the cell wall of certain bacteria) are less effective antigens, and the immune response may not provide as good protection.
Passive immunity is the transfer of antibody produced by one human or other animal to another. Passive immunity provides protection against some infections, but this protection is temporary. The antibodies will degrade during a period of weeks to months, and the recipient will no longer
- Transfer of antibody produced by one human or other animal to another
- Temporary protection
- Transplacental most common source in infancy
The most common form of passive immunity is that which
an infant receives from its mother. Antibodies are transported
across the placenta during the last 1–2 months of
pregnancy. As a result, a full-term infant will have the same
antibodies as its mother. These antibodies will protect the
infant from certain diseases for up to a year. Protection is
better against some diseases (e.g., measles, rubella, tetanus)
than others (e.g., polio, pertussis).
Many types of blood products contain antibody. Some products (e.g., washed or reconstituted red blood cells) contain a relatively small amount of antibody, and some (e.g., intravenous immune globulin and plasma products)
contain a large amount.
In addition to blood products used for transfusion (e.g.,
whole blood, red cells, and platelets) there are three major
sources of antibody used in human medicine. These are
homologous pooled human antibody, homologous human
hyperimmune globulin, and heterologous hyperimmune
Sources of Passive Immunity
- Almost all blood or blood products
- Homologous pooled human antibody (immune globulin)
- Homologous human hyperimmune globulin
- Heterologous hyperimmune serum (antitoxin)
Homologous pooled human antibody is also known as
immune globulin. It is produced by combining (pooling)
the IgG antibody fraction from thousands of adult donors
in the United States. Because it comes from many different
donors, it contains antibody to many different antigens. It is
used primarily for postexposure prophylaxis for hepatitis A
and measles and treatment of certain congenital immunoglobulin
Homologous human hyperimmune globulins are antibody
products that contain high titers of specific antibody. These
products are made from the donated plasma of humans
with high levels of the antibody of interest. However,
since hyperimmune globulins are from humans, they also
contain other antibodies in lesser quantities. Hyperimmune
globulins are used for postexposure prophylaxis for several
diseases, including hepatitis B, rabies, tetanus, and varicella.
Heterologous hyperimmune serum is also known as antitoxin.
This product is produced in animals, usually horses
(equine), and contains antibodies against only one antigen.
In the United States, antitoxin is available for treatment of
botulism and diphtheria. A problem with this product is
serum sickness, an immune reaction to the horse protein.
- Derived from a single type, or clone, of antibody-producing cells (B cells)
- Antibody is specific to a single antigen or closely related group of antigens
- Used for diagnosis and therapy of certain cancers and autoimmune and infectious diseases
Immune globulin from human sources is polyclonal; it
contains many different kinds of antibodies. In the 1970s,
techniques were developed to isolate and "immortalize"
(cause to grow indefinitely) single B cells, which led to the
development of monoclonal antibody products. Monoclonal
antibody is produced from a single clone of B cells, so these
products contain antibody to only one antigen or closely
related group of antigens. Monoclonal antibody products
have many applications, including the diagnosis of certain
types of cancer (colorectal, prostate, ovarian, breast),
treatment of cancer (B-cell chronic lymphocytic leukemia,
non-Hodgkin lymphoma), prevention of transplant rejection,
and treatment of autoimmune diseases (Crohn disease,
rheumatoid arthritis) and infectious diseases.
A monoclonal antibody product is available for the prevention of respiratory syncytial virus (RSV) infection. It is called palivizumab (Synagis). Palivizumab is a humanized monoclonal antibody specific for RSV. It does not contain any
other antibody except RSV antibody, and so will not interfere with the response to a live virus vaccine.
Antibody for Prevention of RSV
- Palivizumab (Synagis)
- contains only RSV antibody
- will not interfere with the response to a live virus vaccine
Active immunity is stimulation of the immune system to produce antigen-specific humoral (antibody) and cellular
immunity. Unlike passive immunity, which is temporary, active immunity usually lasts for many years, often for a
One way to acquire active immunity is to survive infection with the disease-causing form of the organism. In general, once persons recover from infectious diseases, they will have lifelong immunity to that disease. The persistence of
protection for many years after the infection is known as immunologic memory. Following exposure of the immune system to an antigen, certain cells (memory B cells) continue to circulate in the blood (and also reside in the bone marrow) for many years. Upon reexposure to the antigen, these memory cells begin to replicate and produce antibody very rapidly to reestablish protection.
- Active immunity produced by vaccine
- Immunity and immunologic memory similar to natural infection but without risk of disease
Another way to produce active immunity is by vaccination. Vaccines interact with the immune system and often
produce an immune response similar to that produced by the natural infection, but they do not subject the recipient
to the disease and its potential complications. Many vaccines also produce immunologic memory similar to that
acquired by having the natural disease.
Many factors may influence the immune response to vaccination. These include the presence of maternal antibody, nature and dose of antigen, route of administration, and the presence of an adjuvant (e.g., aluminum-containing material added to improve the immunogenicity of the vaccine). Host factors such as age, nutritional factors, genetics, and coexisting disease, may also affect the response.
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Classification of Vaccines
Classification of Vaccines
- Live attenuated
There are two basic types of vaccines: live attenuated and inactivated. The characteristics of live and inactivated vaccines are different, and these characteristics determine how the vaccine is used.
Live attenuated vaccines are produced by modifying a disease-producing ("wild") virus or bacterium in a laboratory. The resulting vaccine organism retains the ability to replicate (grow) and produce immunity, but usually does
not cause illness. The majority of live attenuated vaccines available in the United States contain live viruses. However,
one live attenuated bacterial vaccine is available.
Inactivated vaccines can be composed of either whole viruses or bacteria, or fractions of either. Fractional vaccines are either protein-based or polysaccharide-based. Protein-based vaccines include toxoids (inactivated
bacterial toxin) and subunit or subvirion products. Most polysaccharide-based vaccines are composed of pure cell
wall polysaccharide from bacteria. Conjugate polysaccharide vaccines contain polysaccharide that is chemically linked
to a protein. This linkage makes the polysaccharide a more potent vaccine.
The more similar a vaccine is to the disease-causing form of the organism, the better the immune response to the vaccine.
Live Attenuated Vaccines
Live vaccines are derived from "wild," or disease-causing, viruses or bacteria. These wild viruses or bacteria are attenuated, or weakened, in a laboratory, usually by repeated culturing. For example, the measles virus used as a vaccine
today was isolated from a child with measles disease in 1954. Almost 10 years of serial passage using tissue culture media
was required to transform the wild virus into attenuated vaccine virus.
Live Attenuated Vaccines
*except those administered orally
- Attenuated (weakened) form of the "wild" virus or bacterium
- Must replicate to be effective
- Immune response similar to natural infection
- Usually produce immunity with one dose*
To produce an immune response, live attenuated vaccines must replicate (grow) in the vaccinated person. A relatively small dose of virus or bacteria is administered, which replicates in the body and creates enough of the organism
to stimulate an immune response. Anything that either damages the live organism in the vial (e.g., heat, light) or
interferes with replication of the organism in the body (circulating antibody) can cause the vaccine to be ineffective.
Although live attenuated vaccines replicate, they usually do not cause disease such as may occur with the "wild" form of the organism. When a live attenuated vaccine does cause "disease," it is usually much milder than the natural disease
and is referred to as an adverse reaction.
The immune response to a live attenuated vaccine is virtually identical to that produced by a natural infection. The immune system does not differentiate between an infection with a weakened vaccine virus and an infection with a wild
virus. Live attenuated vaccines produce immunity in most recipients with one dose, except those administered orally.
However, a small percentage of recipients do not respond to the first dose of an injected live vaccine (such as MMR or
varicella) and a second dose is recommended to provide a very high level of immunity in the population.
Live attenuated vaccines may cause severe or fatal reactions as a result of uncontrolled replication (growth) of the vaccine virus. This only occurs in persons with immunodeficiency (e.g., from leukemia, treatment with certain drugs, or
human immunodeficiency virus (HIV) infection).
Live Attenuated Vaccines
- Severe reactions possible
- Interference from circulating antibody
- Fragile — must be store and handled carefully
A live attenuated vaccine virus could theoretically revert to its original pathogenic (disease-causing) form. This is known to happen only with live (oral) polio vaccine.
Active immunity from a live attenuated vaccine may not
develop because of interference from circulating antibody to the vaccine virus. Antibody from any source (e.g., transplacental, transfusion) can interfere with replication of the vaccine organism and lead to poor response or no response
to the vaccine (also known as vaccine failure). Measles vaccine virus seems to be most sensitive to circulating antibody. Polio and rotavirus vaccine viruses are least affected.
Live attenuated vaccines are fragile and can be damaged or destroyed by heat and light. They must be handled and
Live Attenuated Vaccines
* not available in the U.S.
- Viral — measles, mumps, rebella, vaccinia, varicella, zoster, yellow fever, rotavirus, intranasal influenza, oral polio*
- Bacterial — BCG*, oral typhoid
Currently available live attenuated viral vaccines are measles, mumps, rubella, vaccinia, varicella, zoster (which contains the same virus as varicella vaccine but in much higher amount), yellow fever, rotavirus, and influenza
(intranasal). Oral polio vaccine is a live viral vaccine but is no longer available in the United States. Live attenuated
bacterial vaccines are bacille Calmette-Guérin (BCG—not currently available in the U.S.) and oral typhoid vaccine.
Inactivated vaccines are produced by growing the bacterium or virus in culture media, then inactivating it with heat and/ or chemicals (usually formalin). In the case of fractional vaccines, the organism is further treated to purify only those components to be included in the vaccine (e.g., the polysaccharide capsule of pneumococcus).
- Cannot replicate
- Less interference from circulating antibody than live vaccines
- Generally require 3-5 doses
- Immune response mostly humoral
- Antibody titer diminishes with time
Inactivated vaccines are not alive and cannot replicate. The entire dose of antigen is administered in the injection. These vaccines cannot cause disease from infection, even in an immunodeficient person. Inactivated antigens are less affected by circulating antibody than are live agents, so they may be given when antibody is present in the blood (e.g.,
in infancy or following receipt of antibody-containing blood products).
Inactivated vaccines always require multiple doses. In general, the first dose does not produce protective
immunity, but "primes" the immune system. A protective immune response develops after the second or third dose. In contrast to live vaccines, in which the immune response closely resembles natural infection, the immune response to an inactivated vaccine is mostly humoral. Little or no cellular immunity results. Antibody titers against inactivated antigens diminish with time. As a result, some inactivated vaccines may require periodic supplemental doses to increase, or "boost," antibody titers.
* not available in the U.S.
- Viral — polio, hepatitis A, rabies, influenza*
- Bacterial — pertussis*, typhoid*, cholera*, plague*
- Subunit — hepatitis B, influenza, acellular pertussis, human papillomarvirus, anthrax
- Toxoid — diphtheria, tetanus
Currently available whole-cell inactivated vaccines are limited to inactivated whole viral vaccines (polio, hepatitis A, and rabies). Inactivated whole virus influenza vaccine and whole inactivated bacterial vaccines (pertussis, typhoid, cholera, and plague) are no longer available in the United States. Fractional vaccines include subunits (hepatitis B,
influenza, acellular pertussis, human papillomavirus, anthrax) and toxoids (diphtheria, tetanus). A subunit vaccine for Lyme disease is no longer available in the United States.
Polysaccharide vaccines are a unique type of inactivated subunit vaccine composed of long chains of sugar molecules that make up the surface capsule of certain bacteria. Pure polysaccharide vaccines are available for three diseases:
pneumococcal disease, meningococcal disease, and Salmonella Typhi. A pure polysaccharide vaccine for Haemophilus influenzae type b (Hib) is no longer available in the United States.
The immune response to a pure polysaccharide vaccine is typically T-cell independent, which means that these
vaccines are able to stimulate B cells without the assistance of T-helper cells. T-cell–independent antigens, including polysaccharide vaccines, are not consistently immunogenic in children younger than 2 years of age. Young children
do not respond consistently to polysaccharide antigens, probably because of immaturity of the immune system.
- Salmonella Typhi (VI)
- Haemophilus influenzae type b
Repeated doses of most inactivated protein vaccines cause the antibody titer to go progressively higher, or "boost." This does not occur with polysaccharide antigens; repeat doses of polysaccharide vaccines usually do not cause a
booster response. Antibody induced with polysaccharide vaccines has less functional activity than that induced by protein antigens. This is because the predominant antibody produced in response to most polysaccharide vaccines is IgM, and little IgG is produced.
In the late 1980s, it was discovered that the problems noted above could be overcome through a process called
conjugation, in which the polysaccharide is chemically combined with a protein molecule. Conjugation changes the immune response from T-cell independent to T-cell dependent, leading to increased immunogenicity in infants and antibody booster response to multiple doses of vaccine.
Pure Polysaccharide Vaccines
- Not consistently immunogenic in children younger than 2 years of age
- No booster response
- Antibody with less functional activity
- Immunogenicity improved by conjugation
The first conjugated polysaccharide vaccine was for Hib. A conjugate vaccine for pneumococcal disease was licensed in 2000. A meningococcal conjugate vaccine was licensed in 2005.
Vaccine antigens may also be produced by genetic engineering technology. These products are sometimes referred
to as recombinant vaccines. Four genetically engineered vaccines are currently available in the United States. Hepatitis B and human papillomavirus (HPV) vaccines are produced by insertion of a segment of the respective viral gene into the gene of a yeast cell or virus. The modified yeast cell produces pure hepatitis B surface antigen or HPV capsid protein when it grows. Live typhoid vaccine (Ty21a) is Salmonella Typhi bacteria that have been genetically modified to not cause illness. Live attenuated influenza vaccine has been engineered to replicate effectively in the mucosa of the nasopharynx but not in the lungs.
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