Madison Clarke
Vaccines are designed to protect the body against specific microbes without the risk of infection. They teach the body to produce antibodies, which are proteins in the blood that recognise and destroy harmful invaders. This is achieved through various methods, including the use of weakened or inactivated pathogens, or by delivering instructions on how to create antibodies through mRNA technology. The immune system then learns to recognise and remember these pathogens, allowing it to quickly produce the right antibodies and activate the appropriate immune response if the body encounters the actual pathogen. While some vaccines are very effective at preventing diseases entirely, others may only reduce the severity of illness.
| Characteristics | Values |
|---|---|
| Purpose of vaccines | Teach the body to protect itself against specific microbes without taking the risk of an infection |
| How vaccines work | Vaccines trigger the primary immune response and generate memory cells without making the body sick |
| Types of vaccines | mRNA vaccines, live attenuated vaccines, inactivated vaccines, toxoid vaccines, conjugate vaccines, protein subunit vaccines |
| How do vaccines help the body develop antibodies | Vaccines trigger an immune response, which produces antibodies that protect us from getting sick from that germ in the future |
| Effectiveness of vaccines | Some vaccines completely prevent diseases, while others reduce the severity of illness |
| Side effects of vaccines | Common side effects include pain or swelling at the injection site, headache, chills, or fever |
| Risks associated with vaccines | In rare cases, vaccines may trigger autoimmunity, leading to diseases like rheumatoid arthritis or type 1 diabetes |
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What You'll Learn
How vaccines trigger an immune response
Vaccines help the body develop antibodies against certain diseases. They trigger an immune response by training the body to fight harmful invaders, which are called pathogens or germs, and include viruses and bacteria.
There are several types of vaccines, and they work in different ways to trigger an immune response. Here are some of the common ways:
Using a weakened pathogen
Some vaccines use a weakened form of the entire bacterium or virus (whole agent). As it is the closest to an actual infection, it causes the strongest response of all types of vaccines. Live attenuated vaccines, for example, contain live viruses or bacteria that have been weakened by changing their DNA or by selecting the weakest viruses or bacteria. The immune system identifies these weakened pathogens as foreign and produces antibodies to fight them off.
Using an inactive pathogen
Inactivated vaccines contain viruses that have been killed in a lab using heat or chemicals. Inactivated pathogens cannot reproduce or cause illness but can still produce an immune response. When a person receives an inactivated vaccine, their immune system identifies the inactive viruses as foreign and produces antibodies to fight them off.
Using parts of the virus or bacteria
Vaccines may also use only a small part of the virus or bacterium, called an antigen. When a person gets vaccinated, their immune system recognises the antigen as foreign. This activates immune cells to produce antibodies and create a memory of the virus or bacterium. Later, if the person comes into contact with the actual virus or bacterium, their immune system will remember it and produce the right antibodies to kill the virus or bacterium.
Using mRNA
MRNA vaccines use mRNA created in a laboratory to teach our cells how to make a protein or a piece of a protein that triggers an immune response inside our bodies. This protein is recognised as foreign by the immune system, which then activates immune cells and creates antibodies. This process trains the immune system to fight off viruses that contain that protein.
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How antibodies are produced
Vaccines help the body develop antibodies against certain diseases. They trigger an immune response, which produces antibodies that protect us from getting sick from that germ in the future.
The process of antibody production involves antigen preparation, animal immunization, screening, antibody purification, and quality control. First, a suitable antigen is generated as the foundation for obtaining high-quality antibodies. The antigen is then administered to animals to stimulate antibody production. The antibodies are then screened, purified, and undergo quality control testing to yield a product that meets the intended application.
There are three main types of antibodies: polyclonal, monoclonal, and recombinant antibodies. Polyclonal antibodies are typically manufactured in rabbits, while monoclonal antibodies are generated by hybridoma technology. Recombinant antibodies, on the other hand, are produced through genetic engineering. This involves cloning the antibody gene into an expression vector and transfecting it into host cells to obtain the desired antibodies.
In the human immune system, antibodies are produced when the body encounters foreign molecules, typically proteins. Specialized cells such as macrophages and dendritic cells capture these molecules and break them down to present these antigens to B-cell lymphocytes. Each B-cell lymphocyte then produces a unique antibody against a specific antigen.
The primary immune response involves B-cells producing antibodies that match specific pathogens like a lock and key. These antibodies grab onto harmful invaders, marking them as foreign and dangerous. This triggers the immune system to destroy the infection and other health-threatening cells.
The secondary immune response occurs when the body encounters the same invader for the second time. Memory cells quickly respond to the invader, releasing a flood of antibodies to destroy it before it can make you sick. Vaccines aim to trigger this primary immune response and generate memory cells, training the immune system to fight off harmful invaders without causing actual infection.
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How vaccines teach the body to protect itself
Vaccines teach the body to protect itself by training the immune system to fight off harmful invaders. Vaccines contain either a weakened or an inactivated form of a virus or bacterium, or a small part of it, called an antigen.
When a person gets vaccinated, their immune system recognises the antigen as foreign. This activates immune cells to produce antibodies and create a memory of the virus or bacterium. Antibodies are proteins in the blood that can use a "key" to grab onto harmful invaders so that the immune system can destroy them. This is your primary immune response.
Once your body has seen a pathogen, your body adds special immune cells (memory cells) that keep a lookout for the pathogen. The memory cells keep a kind of "wanted poster" of harmful invaders and know which tools (antibodies) to call in to fight off a future infection. This is called your secondary immune response, which is much quicker. The invader is destroyed before it can make more copies of itself and make you sick.
MRNA vaccines, for example, use mRNA created in a laboratory to teach our cells how to make a protein or a piece of a protein that triggers an immune response inside our bodies. This immune response, which produces antibodies, is what helps protect us from getting sick from that germ in the future.
Live attenuated vaccines, on the other hand, contain live viruses or bacteria that have been weakened. They cannot cause disease but can still produce an immune response in the body. This type of vaccine produces a strong immune response that can last a long time, meaning fewer doses may be needed.
Vaccines are an incredible invention, as they teach the body to protect itself against specific microbes without taking the risk of an infection.
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Types of vaccines
Vaccines help the body develop antibodies against certain diseases. They do this by training the immune system to fight off harmful invaders.
There are several types of vaccines, each designed to teach the immune system how to combat specific kinds of germs and the serious diseases they cause. Here are some of the most common types:
Live Attenuated Vaccines
Live attenuated vaccines use a weakened form of the entire bacterium or virus. As it is the closest to a natural infection, it elicits a strong immune response. Live vaccines are very effective in creating a long-lasting immune response. Usually, only one or two doses are needed to provide full protection for a lifetime. Examples include the measles, mumps, and rubella (MMR) vaccine, and the chickenpox vaccine.
Inactivated Vaccines
Inactivated vaccines contain viruses that have been killed in a laboratory using heat or chemicals. They cannot reproduce or cause illness but can still trigger an immune response in the body. Inactivated vaccines usually require multiple doses (booster shots) to provide ongoing immunity against diseases.
MRNA Vaccines
MRNA vaccines use mRNA created in a laboratory to teach our cells how to make a protein that triggers an immune response in the body. This immune response produces antibodies, protecting us from getting sick from that germ in the future. mRNA vaccines have several benefits, including shorter manufacturing times and no risk of causing disease in the vaccinated individual.
Viral Vector Vaccines
Viral vector vaccines use a modified version of a different virus as a vector to deliver protection. They can trigger a strong immune response, offering a high level of protection against infection or severe disease.
Toxoid Vaccines
Toxoid vaccines use inactivated toxins to target the toxic activity created by bacteria, rather than targeting the bacteria itself. They are particularly effective in preventing certain toxin-mediated diseases such as tetanus, diphtheria, and pertussis.
Subunit Vaccines
Subunit vaccines only contain specific pieces of the pathogen, such as its protein or sugar, instead of the whole organism. This means they cannot cause infection and are suitable for people who cannot receive live vaccines, including young children, older people, and immunocompromised individuals.
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Benefits and risks of vaccines
Vaccines are one of the most successful public health interventions in reducing disease spread and preventing complications and deaths from vaccine-preventable diseases. Vaccines work by triggering an immune response in our bodies, which then produces antibodies to protect us from getting sick from a particular germ in the future. Vaccines can protect against either a single or multiple diseases, and they can be administered simultaneously to protect against several diseases.
Vaccines are recommended throughout our lives to protect against serious diseases. Children are especially susceptible to diseases at a young age, and the recommended immunization schedule provides them with maximum protection early in life. Adolescents require vaccines that extend protection as the protection from childhood vaccines wears off.
While vaccines have proven to be highly effective, they do not offer 100% protection, and their efficacy varies depending on the type of vaccine and the health status of the vaccinated individual. For example, the flu vaccine is less effective in the elderly than in younger people. However, studies suggest that the flu vaccine reduces the severity of the illness, hospitalization, and death rates among the elderly.
The most common side effects of vaccines are mild and include redness, soreness, and swelling at the injection site. These side effects are normal signs that the body is building protection and typically go away within a few days. Serious side effects, such as severe allergic reactions, are rare, and medical professionals are trained to manage them.
The benefits of vaccination in preventing disease and reducing its severity far outweigh the potential side effects. However, it is important to carefully consider the risks and benefits of each vaccine and ensure that the population remains vigilant in preventing the spread of vaccine-preventable diseases through proper hygiene, staying home when sick, and other infection prevention measures.
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Frequently asked questions
Vaccines teach the body to protect itself against specific microbes without taking the risk of an infection. They trigger the body's primary immune response and generate memory cells without making the person sick.
There are several types of vaccines, including inactivated vaccines, subunit vaccines, mRNA vaccines, live attenuated vaccines, and toxoid vaccines.
Vaccines trigger an immune response in the body, which produces antibodies. These antibodies are proteins in the blood that can recognise and destroy harmful invaders.
While vaccines are generally safe, there is a risk of side effects such as pain, swelling, headache, chills, or fever. In rare cases, vaccines may also trigger autoimmune diseases, where the body's immune system attacks its own cells. However, the benefits of vaccines in preventing serious diseases greatly outweigh the risks.
