Madison Clarke
Vaccines are designed to protect against viruses without exposing the recipient to the potentially serious consequences of contracting the virus. COVID-19 vaccines, for example, train the immune system to recognize and fight the virus that causes COVID-19, SARS-CoV-2. They do not contain the virus itself, but rather a harmless piece of the virus, such as the spike protein, or instructions for the body to make this protein (mRNA). This triggers an immune response, producing antibodies and activating immune cells to fight off future infection. While COVID-19 vaccines do not completely block transmission, they reduce the severity of the disease and blunt transmission to some extent.
| Characteristics | Values |
|---|---|
| Purpose of Vaccines | Vaccines help our bodies develop immunity to viruses. |
| How Vaccines Work | Vaccines train our bodies to recognize and fight harmful pathogens. |
| Types of Vaccines | mRNA vaccines, protein subunit vaccines |
| mRNA Vaccines | Contain instructions for making a single part of a pathogen so the immune system can recognize and fight it. |
| Protein Subunit Vaccines | Contain pieces of the virus that causes the disease and adjuvants that help the immune system respond to the virus. |
| Vaccine Safety | Vaccines are safe and effective, undergoing intense safety monitoring. Mild side effects may include pain, redness, or swelling at the injection site. |
| Vaccine Development | Vaccines are developed in laboratories and undergo clinical trials to ensure safety and effectiveness. |
| Benefits of Vaccines | Vaccines save lives, prevent severe disease and hospitalizations, and reduce the risk of long COVID. |
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What You'll Learn
COVID-19 vaccines do not contain the virus
COVID-19 vaccines use mRNA technology, which does not use the live virus that causes COVID-19. Instead, mRNA teaches our cells how to make a protein or a piece of a protein that triggers an immune response in our bodies. This immune response teaches our bodies how to recognize and destroy the virus if we are ever infected with COVID-19 in the future.
MRNA vaccines are safer because they do not contain live viruses. The mRNA vaccines for COVID-19 are injected into the muscle of the upper arm. Once inside the body, the mRNA gives our cells instructions to make a spike protein, a small, harmless piece of the COVID-19 virus. The spike protein does not cause infection or sickness. After the spike protein is made, the immune system recognizes that it doesn't belong and begins making T-cells and antibodies that recognize the spike protein.
While some vaccines do use a whole killed virus, parts of a virus, or harmless viruses as transport, COVID-19 vaccines do not. COVID-19 vaccines have been rigorously assessed for safety and have been shown to provide a long-lasting immune response.
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Vaccines train your immune system to recognise the virus
Vaccines expose the body to a small amount of an antigen, which is a unique subpart of a pathogen—a bacterium, virus, parasite, or fungus that causes disease. Antigens trigger the immune system to produce antibodies, which are proteins that recognise and destroy specific antigens.
Vaccines introduce an antigen into the body without causing infection. The body then creates antibodies to fight off the perceived infection. If the vaccinated individual later encounters the pathogen, the body can quickly produce the necessary antibodies to destroy the antigen and stop the disease. This process is also known as developing immunity.
Vaccines use different methods to achieve this goal depending on the underlying technology. Traditional vaccines contain a weakened or dead pathogen, or a part of it. For example, the measles vaccine contains a live but weakened form of the virus, while the tetanus vaccine contains a dead or inert form of the bacterium.
MRNA vaccines, on the other hand, do not contain any part of the pathogen. Instead, they carry instructions that direct cells to produce a protein or a piece of a protein unique to the pathogen. This protein is recognised by the immune system as foreign, triggering the production of antibodies. The mRNA vaccine for COVID-19, for instance, prompts the body to produce a harmless piece of the spike protein found on the surface of the virus. The immune system then recognises that the spike protein does not belong, activating immune cells to fight off the perceived infection.
Vaccines are an effective way to protect yourself and your community from preventable diseases. They have successfully eradicated or controlled diseases such as smallpox, polio, measles, meningitis, tetanus, and wild poliovirus. Vaccines have also played a crucial role in combating the global COVID-19 pandemic.
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Vaccines use mRNA to train the immune system
Vaccines do not contain the virus. Instead, they contain instructions for making a single part of a pathogen (germ) so that the immune system can recognize it and generate tools to fight it. In the case of COVID-19 vaccines, the instructions are for making a harmless piece of the spike protein, which is found on the surface of the virus.
MRNA vaccines are a type of preventive treatment that trains the body's immune system to fight infectious diseases. They work by giving the body instructions to make a small part of the virus so that the immune system can generate tools to fight an infection if it encounters the virus again in the future.
MRNA, or messenger ribonucleic acid, is a molecule in cells that copies instructions from DNA and brings them to ribosomes (protein-making structures in cells). The mRNA in vaccines carries the instructions for making a single part of a pathogen so that the immune system can recognize it and create tools to fight it.
MRNA-based COVID-19 vaccines have been shown to train the 'long-term memory' of the immune system. Researchers at the University of Cologne and University Hospital Cologne found that these vaccines cause persistent epigenetic changes in innate immune cells, leading to enhanced immune responses to future encounters with pathogens.
The innate immune system provides general protection from pathogens and must react quickly. The adaptive immune system, on the other hand, adapts to new pathogens and is highly specific in its response. Both systems work closely together. The epigenetic changes caused by mRNA vaccines may provide the basis for long-lasting innate immunity that broadens the protection mechanisms of the acquired immune system.
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Protein subunit vaccines contain pieces of the virus
Vaccines do not contain the virus itself. Instead, they train the body to fight diseases by helping it learn to recognise and create tools to combat harmful pathogens.
Protein subunit vaccines, for example, contain pieces of the virus—these are known as proteins. In the case of COVID-19, the protein piece is called the spike protein, which is found on the surface of the virus. Once the vaccine is administered, our cells pick up these proteins. Our immune system then recognises that these proteins do not belong there. Another ingredient in the vaccine, called an adjuvant, helps our immune system to produce antibodies and activate other immune cells to fight off what it thinks is an infection.
The benefit of protein subunit vaccines is that they only contain pieces of a pathogen, not the whole organism, so they cannot make you sick or cause infection. This makes them suitable for people who should not receive "live" vaccines, such as young children, older people, and immunocompromised people.
MRNA vaccines, on the other hand, 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. mRNA vaccines are currently only available for COVID-19.
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Vaccines do not block transmission but reduce severity
Vaccines do not contain the virus. Instead, they contain a harmless piece of the spike protein found on the surface of the virus that causes COVID-19. This spike protein is what triggers the body's immune system to produce antibodies and activate other immune cells to fight off what it thinks is an infection.
While vaccines are designed to protect against viruses, it is important to note that they do not completely block transmission. Instead, they primarily focus on reducing the severity of the disease. This means that a vaccinated person may still be able to spread the virus, but they are less likely to develop serious illness or require hospitalization if they contract it. This reduction in severity is crucial in lowering the overall impact of the disease on both individual health and the healthcare system.
The effectiveness of vaccines in blocking transmission or reducing severity can vary depending on factors such as the type of vaccine, the virus, and individual characteristics. For example, in the case of COVID-19, the initial vaccines were found to be highly effective in preventing severe disease, but the emergence of new variants, such as Omicron, has raised questions about their ability to prevent transmission. Studies are still ongoing to determine the impact of vaccination on transmission rates, particularly for healthcare workers and care home staff, who are frequently tested.
It is worth noting that the focus on transmission versus severity is a subject of debate. Some researchers argue that the priority should be reducing transmission by vaccinating active, working-age individuals who are more likely to spread the virus. On the other hand, others suggest that developing vaccines that prevent transmission completely may not be necessary. Lower viral loads, which can be achieved through vaccination, typically lead to less severe disease, even if the virus is still spread at low levels.
While vaccines may not entirely block transmission, they play a crucial role in mitigating the impact of diseases like COVID-19. They help protect individuals from severe illness and reduce the burden on healthcare systems. As research progresses, scientists continue to work towards developing more effective vaccines and improving our understanding of immunity to create a more comprehensive defense against infectious diseases.
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Frequently asked questions
No, the virus is not put into the vaccine. However, the vaccine does contain a harmless piece of the spike protein found on the surface of the virus that causes COVID-19. This spike protein is what trains your immune system to recognize and fight off the actual virus.
COVID-19 vaccines use different methods to train the body's immune system to recognize and respond to the virus. Some vaccines, like mRNA vaccines (Moderna and Pfizer-BioNTech), provide the body with instructions (mRNA) to produce a harmless piece of the virus. Other vaccines, like protein subunit vaccines (Novavax), contain a small part of the virus directly, along with an adjuvant that helps the immune system respond.
By using harmless pieces of the virus or its genetic material, the vaccine teaches your body to recognize and fight off the virus without ever having to risk the serious consequences of an actual COVID-19 infection. This way, you can develop immunity and protect yourself from future infections without experiencing the potentially harmful effects of the disease.
