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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Diabetic Profile The diabetic profile is a set of tests which are used for testing and monitoring the various kinds…
hidden benefits walking
9 benefits of walking we bet you didn’t know! Did you know walking can be the miracle pill for eternal youth? Everyone knows walking is good for…
lose weight fast
12 easy and instant steps to successful weight loss Do you want to lose weight without losing your mind? Does weight loss always mean saying goodbye to…
Bromelain: 11 reasons why you should start adding pineapple to your pizza! If you didn't love pineapples already, here are some of the top health benefits that bromelain can bring…
Mood swings
The real reasons for your mood swings and how to overcome them Are you prone to heated moods frequently? Do you also feel bouts of depressive feeling creeping up on…
What is the right way to take a pregnancy test? A pregnancy test is undertaken to determine if you have conceived. A home pregnancy test is the most…
Is bronchitis contagious? And how to prevent this infection? It is acute bronchitis that is contagious which means you can contract it from another person or you…
sodium chloride
Halotherapy: How inhaling salt can work wonders for your body Halotherapy is quickly gaining popularity amongst those with respiratory diseases. It has shown promise in its treatment.
SIBO Diet: The important dos and don’ts of this gut-healing diet A SIBO diet is a diet that works by eliminating certain sugars from your diet and adding fibers…
liver cleanse detox
14 go-to foods that are best for a complete natural liver detox Liver cleanse can be achieved by just choosing or avoiding certain types of food. Liver itself is a detoxifying…
Balneotherapy jacuzzi
5 things you didn’t know about balneotherapy and how you can do it at home Sauna baths have been popular since a long time. But how much more beneficial can balneotherapy be as…
CT-scan-machine
CT – Computed Tomography Scan CT scan or computed tomography scan is an diagnostic imaging technique where cross-sectional images of body are obtained…
Chest X-Ray A chest x-ray is a diagnostic test that uses x-rays to visualize the structures inside your chest. It…
hepatitis B envelope antigen
Hepatitis B Envelope Antigen (HBeAg) The HBeAg or hepatitis B envelope antigen test is a screening test used to diagnose the onset of…
SHBG test
Sex Hormone Binding Globulin (SHBG) Test SHBG is an important sex hormone that is linked to testosterone in men and estrogen in women. Abnormal…
dhea adrenal
Androstenedione Test Androstenedione is produced by the adrenal gland, the test of the levels of Androstenedione helps in the evaluation…
stress depressed anxiety
Are you depressed or just stressed? Know when to see a doctor Why are some people more anxious than others? Is being depressed the same as feeling sad? Have you…
Serotonin happiness
Serotonin: What you didn’t know about this “feel-good” chemical Serotonin : Did you know that this "feel-good" hormone could well impact your sleep cycle, sex drive, appetite,…
sleep deprivation
Don’t let your sleep deficit grow into memory loss or heart attack Why is sleep important for us? How could sleep deprivation harm you? We bet you didn't know about…
Dragon Fruit – Blessing from Nature’s Basket The dragon fruit is packed with nutrients and yet low on calories and is the dream food that…