Vaccines

Vaccines child

Last Updated February 20th, 2019

Overview of vaccines

Numerous diseases can impact health and lifestyle at any point in time during an individual’s life. Few of them are contagious, few are fatal and few are resistible. Irrespective of the nature of the disease, the human body should have the capacity, more precisely the immune capacity to combat the pathogens or causative agents triggering these diseases. This necessitates adequate immunization in childhood through the injection of vaccines. But before that, a proper knowledge of the required vaccinations and possible reactions is necessary so as to determine the types of immunizations a child can sustain. Unfortunately, in many countries, the knowledge related to immunizations is lacking and this has resulted in 19.4 million immunocompromised infants worldwide in the year 2015.

 

What are vaccines?

VaccinesVaccines are medically defined as antigenic agents synthesized from the causative agent of a disease (or any other artificial substitute of the same) which are essential for building body immunity against several diseases. There are specific vaccines for different diseases and each of them has a significant role in building the body’s immune capacity. Vaccines are also known to be used to treat certain diseases (therapeutic vaccines). Vaccines are normally delivered in liquid form via injections, or via oral or intranasal paths. Vaccines are usually synthesized from whole microorganisms or specific components of microorganisms and provide protection against that particular pathogen (viral or bacterial) in future.

 

What are the properties of vaccines?

Two primary factors determine the disease-preventing ability of a vaccine. These are-

  • Effectiveness and durability of the administered vaccine
  • Vaccination coverage in a given population

Vaccines adultTwo important properties that determine the utility of vaccines are –

  • Vaccine effectiveness– It is defined as the performance of a particular vaccine under varying field conditions. Vaccine effectiveness strongly depends on the performance of vaccine delivery programs. It basically measures the ability of a vaccine to prevent the detrimental effects of a certain disease (such as hospitalization or death).
  • Vaccine efficacy– It is defined as the performance of a particular vaccine under specific study conditions (prospective approach). Vaccine efficacy measures the extent of prevention of a disease.

Apart from the ones discussed above, all vaccines should have the following essential properties-

  • Ability to provide long-lasting immunity
  • Ability to provide both humoral (extracellular) and cellular immunity
  • Should not trigger autoimmune effects or hypersensitivity
  • Should have a reasonable cost of production
  • Can be stored and delivered under normal environmental conditions
  • Should be safe to use

 

Types of immunizations

Immunizations are broadly classified into two categories. These are described below-

  • Active immunization: It is the type of immunization acquired via past occurrence of a particular disease. Individuals surviving the disease (caused by a specific pathogen) are less susceptible to the same disease in future. Active immunization involves the production of antibodies (humoral or cellular) in response to a specific antigen. Vaccines can induce active immunization by creating immunological memory (generate immune response similar to that evoked by a natural disease). It is usually long lasting in nature.
  • Passive immunization: It is the type of immunization in which antibodies are passed on to one person from another, such as from mother to fetus. This type of immunization is temporary in nature and cannot provide protection after the progressive degradation of antibodies. Transplacental immunization is the most common example of this type.

 

The working mechanism of vaccines

Vaccines childWhen vaccines are injected into the body in the form of inactivated or weakened pathogens, an immune response is triggered, which is similar to the body’s natural response to an infection.

The only difference is that in case of artificially injected pathogens, possibilities of occurrence of the disease is nil since the pathogens are in benign condition and do not have the capacity to cause infections.

The disease-causing pathogens are called “antigens” and the substances produced by the body in response to these antigens are called “antibodies”.

The antibodies combine with the antigens and destroy them through the mediation of the immune cells of the body (T lymphocytes). The artificially induced immune response creates immunological memory (both humoral and cellular) within the body and helps the body identify and destroy similar infectious pathogens in the future. In this way, diseases are prevented effectively.

 

Different types of vaccines

Vaccines are classified into different categories depending on the source of derivation and composition. These are discussed below-

Live attenuated vaccines

These vaccines are extracted from disease-causing bacteria or virus. These pathogens are attenuated and inactivated in the laboratory through repeated testing and culturing. Multiplication of the attenuated pathogens (in the form of vaccines) occurs within the body of the vaccinated person for a considerable period of time, which in turn triggers an immune response. These vaccines are usually provided in low dosage and do not cause disease within the body. In few rare cases, they might induce infections of very mild nature since these pathogens are almost benign in nature.

 What are the advantages? 

  • The injected microbes can help generate immunological memory similar to the one induced by natural disease.
  • Only a very small dosage is required since these microbes replicate within the body.
  • One time administration is enough for long-lasting immunity. Multiple booster doses are unnecessary.
  • Administration of whole microbes can cause protection against few other kinds of infections as well.
  • Few vaccines of this category can be delivered orally and can provide effective protection against the pathogen at the site of infection itself (Eg: vaccines for mucosal immunity and IgA synthesis). These oral vaccines are much cheaper.
  • These vaccines can help regulate epidemics.

What are the disadvantages?

  • In few rare cases, these supposedly benign vaccines may transform into virulent forms and cause severe infections.
  • Live attenuated vaccines cannot be provided to individuals having very weak immunity since they can cause serious illnesses and even death.
  • Optimum storage conditions are required since these microbes need to be in a condition to replicate after administration into the individual’s body.
  • Intervention by circulating antibodies in the body may impede the development of active immunity due to poor immune response.
  • These microbes are easily degradable and are extremely thermosensitive and photosensitive.

Inactivated vaccines

These vaccines are produced via bacterial and viral culturing in the laboratories and are then inactivated by heat or chemicals (mostly formalin). For synthesizing fractional vaccines, the inactivated microbes are further cultured and treated to extract only those components of the pathogen essential for vaccine preparation. A common example of this type is the polysaccharide capsule of Pneumococcus, In this case, chances of infection after administration of the vaccines are nil (even in an immunosuppressed individual) since the microbes are dead and cannot multiply within the body. A full dosage of the vaccine is administered at the same time. Two to three booster doses are required in this case for full protection against the disease. Examples of inactivated whole virus vaccines are- Influenza, Polio, Rabies and Hepatitis A. Examples of inactivated whole bacterial vaccines are- Pertussis, Typhoid, Cholera, and Plague.

 What are the advantages?

  • It is very safe to use and can be administered to immunosuppressed individuals and pregnant women
  • They are cheaper than attenuated vaccines
  • Optimum storage conditions are not required since the microbes are inactivated
  • They are not disturbed by circulating antibodies

What are the disadvantages?

  • A full dose of the vaccine has to be injected since the pathogens do not replicate within the body
  • A single dose only provides primary immunity. But for full immunity, multiple booster doses are needed
  • It is not very effective for generating cellular immunity
  • Few vaccines of this class can trigger adverse reactions after injection (Eg: encephalomyelitis induced by Bordetella pertussis)

Subunit vaccines 

Subunit vaccines are prepared from fractional components of the microorganism instead of the entire microbe. This is done in order to extract those antigens that provide protective immunity. Subunit vaccines are mainly made up of toxoids, subcellular components, and surface antigens. The performance of subunit vaccines is enhanced by administering them with adjuvants. They facilitate sustained immune stimulation.

 What are the advantages?

  • These vaccines can be safely administered to immunodeficient people
  • They normally do not produce side effects

What are the disadvantages?

  • These vaccines are less effective in terms of antigenicity. For example, peptide segments do not produce the same immune effect as that of the entire organism.
  • Some of the peptides are closely linked to the Human Leukocyte Antigen (HLA) and hence cannot provide complete immunity against all kinds of diseases.

Polysaccharide vaccines

These are a category of subunit vaccines made up of sugar molecule chains and are often found on the surface capsules of few bacteria. Immune response triggered by polysaccharide vaccines are usually T-cell independent. These vaccines are not very effective in immunodeficient people especially in infants (since they have immature immune systems). Performance of polysaccharide vaccines induced antibody is less than that induced by protein antigens because, in the former, very less IgG is produced. Examples of Polysaccharide vaccines are Pneumococcal, Meningococcal and Salmonella typhi.

Conjugate vaccines

These are primarily synthesized from capsulated bacteria and eliminate the problems related to polysaccharide vaccines. The conjugated bonds transform the immune response from T-cell independent to T-cell dependent. This enhances immunogenicity in infants. But one major disadvantage is that the extracted capsulated antigen acts as subunit vaccine and can enhance only humoral (extracellular) immunity. Also, multiple booster doses are required to induce complete immunity.

Recombinant vaccines

The vaccines produced by means of recombinant DNA technology or genetic engineering are called recombinant vaccines. The different means of preparation of this kind of vaccines are-

  • Use of engineered vector (Eg: Vaccinia virus)
  • Introducing mutation by deleting a portion of DNA
  • Reassortment of genomes of virulent and avirulent variants
  • Edible vaccines produced via introducing genetic coding for significant antigens in plants

What are the advantages?

  • These vaccines can be safely administered and are easy to store
  • Antigen segments having adverse effects can be safely removed from the main vaccine. Eg: Cholera toxin A can be safely eliminated from cholera vaccine

 What are the disadvantages?

  • Cost of production is high since the synthesizing process involves relocation, cloning, and expression of the antigen in the new vector
  • It generates adverse reactions in immunodeficient people

DNA vaccines

These types of vaccines are still in the research stage. In this case, the required antigens are located and cloned. The DNA is injected into the muscle cells of the vaccine recipient. They can also be introduced via the intranasal path. DNA vaccines provide both humoral and cellular immunity.

 What are the advantages? 

  • Transport and storage of DNA vaccines are very easy since the DNA molecules are very stable and are resistant to light and temperature
  • The DNA sequence can be changed anytime in the laboratory as per requirements
  • The injected DNA does not replicate and only the necessary proteins are encoded
  • Due to the absence of a protein component, no immune response is created against the inserted vaccine

What are the disadvantages?

  • Insertional mutagenesis may result from insertion of DNA into the host genome
  • Anti-DNA antibodies may be generated in response to introduced DNA

 

The dosage of common vaccines

Dosage recommendations of few common vaccines are listed below-

 

What are the adverse effects of vaccinations?

Infants having severe allergic reactions to vaccines should be immunized only after proper consultation with a pediatrician. In general, the following reactions are observed after immunization-

 

Benefits of vaccination

  • Vaccinations are administered to children to ensure that they do not end up with serious health conditions such as meningitis, measles etc.
  • Vaccinations help in ensuring that children don’t develop or acquire disabling or life-threatening malaises and infections.

Side effects of vaccinations

  • Fever
  • Headache
  • Fatigue
  • Joint or body pain
  • Shivering
  • Soreness or redness at the injection site.

 

Facts

  • A British scientist, Edward Jenner, developed the first smallpox vaccination in 1796.
  • 2-3 million deaths are prevented each year due to vaccines.
  • Vaccines are not always administered in the form of shots; they can be given orally as well.

Facts

  • In the late 18th century, King Charles IV of Spain wanted to spread the smallpox vaccination. He used 22 orphan boys who were vaccinated and their blood was used to make the vaccination

Facts

  • Since its introduction in 1998, the vaccination against bacterial meningitis has brought down the incidence rate of the disease by 99%.

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Dos and Don'ts

Dos
  • Get a flu vaccination every year to help prevent the flu.
  • Take the patient to the hospital in case there are any abnormal reactions posts the vaccination.
  • Maintain a healthy diet of whole-grains before getting a vaccination shot.
Don'ts
  • Vaccinate an infant if they are sick as their immune system would be weak. Doing so can make the pathogens enter the central nervous system and cause life-threatening damages.
  • Get your child vaccinated again with the same vaccines if your child had a reaction to it the first time. Doing so could lead to severe reactions

 

 

 

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GERD heartburn
Heartburn: What are the exact symptoms and the best home remedies? There are easy home remedies for heartburn, which not only acts as a first aid when you experience…
11 unbelievable health benefits of thyme you didn’t know! Thyme is a herb that has been used in alternative medicine.It is a well known seasoning in the…
CBC blood test
CBC (Hemogram 6-part diff) blood test CBC (Hemogram 6-part diff) blood test refers to the test that measures the number of RBCs, WBCs, etc…
hlab27 test
HLA-B27 test The HLA-B27 is a blood test that is used to determine the level of a particular protein called…
serum electrolyte test
Serum Electrolyte If there is an electrolyte imbalance in the body, a serum electrolyte test will help to find out…
antihepatitis core antigent
Anti-Hepatitis B Core Antigen (AHBc) Total Anti-hepatitis B core antigen (AHBC ) is a blood examination and the only serological marker of infectious blood…
rosacea-treatment--before-_-after
The best and safest ways to treat rosacea Rosacea is a skin disease that is characterized by reddish hives and rashes on the face. Read more…
liver detox facts
7 liver detox facts and why ignoring these could kill you! Are you taking care of this organ that handles over 500 different vital functions in your body? Your…
Agave nectar: The bitter truth about this sweetener revealed Agave nectar is considered to be sweeter than the normal table sugar and even contains higher amounts of…
gout diet purines
Gout Diet : Get relief from painful joints by eating these foods Are you a victim of this painful condition? Are medications providing only short relief? Find a list of…
Tamarind: The top health benefits of this staple Asian ingredient Did you know this sweet and sour pulpy fruit does more than just add a tangy flavor to…
Top natural diuretics: The instant benefits you can get from nature’s water pills Since diuretic drugs are known to cause side effects, it is better to choose a natural diuretic that…
Bronchoscopy procedure
Bronchoscopy Bronchoscopy is a procedure where in a scope is inserted into the lung pathway to observe any growth…
Chest X-Ray A chest x-ray is a diagnostic test that uses x-rays to visualize the structures inside your chest. It…
Bloodtestalbumin
Albumin Test Albumin test or blood serum test is a liver function test that measures the amount of the protein…
myelogram
Myelography Myelography is an important diagnostic tool that is used to investigate and identify abnormalities in the spine and…
antiHEV IgM test
Anti hepatitis E virus (Anti HEV) IgM Test Anti HEV IgM test determines the level of the IgM antibodies in the blood, The disease is often…
Diabetes blood test
Diabetic Profile The diabetic profile is a set of tests which are used for testing and monitoring the various kinds…
acne removal tips
Anatomy of acne: 7 instant steps to kiss those zits goodbye Blackheads, whiteheads, or pimples-call them what you may. Acne is never good news.Did you know some of the…
Bulletproof coffee recipe
Bulletproof Coffee – Breakfast of champions or yet another health fad? Can this special ketogenic coffee really make your body race as fast as a bullet?
improve digestion weight loss
Power up your gut: 8 proven steps on how to improve your digestion Did you know you have a colony of bacteria in your gut that help you in digesting food?…