Chloe Ramirez
Vaccines are used to prevent illness from viruses and bacteria by training the body to fight harmful invaders, or pathogens, that cause sickness. Vaccines work by using live or dead pathogens, part of a pathogen, or mRNA to trigger an immune response. This immune response can be activated by introducing a weakened or inactivated form of a virus or bacterium, or a small part of it, called an antigen. The immune system then identifies the antigen as foreign, activating immune cells and creating antibodies. This process trains the immune system to fight off the virus or bacterium, so that if the body encounters the real pathogen, it is better able to fight off the infection.
| Characteristics | Values |
|---|---|
| What do vaccines introduce? | Antigens, which are usually a whole virus or bacterium, or a weakened or inactivated form of it. |
| How do antigens work? | Antigens are the unique parts of a pathogen that the body recognizes as foreign. The body has an immune response to the antigen and will remember how to attack it if it tries to infect again in the future. |
| How do vaccines work? | Vaccines train the body to fight harmful invaders (pathogens) by causing an immune response. They work by using live or dead pathogens, part of a pathogen, or mRNA. |
| What are the different types of vaccines? | mRNA vaccines, protein subunit vaccines, inactivated vaccines, live attenuated vaccines, nucleic acid vaccines, vector vaccines, whole-virus vaccines |
| Are vaccines safe? | Vaccines go through extensive safety testing before being released to the public. |
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What You'll Learn
Vaccines do not use live viruses
Vaccines are used to prevent illness from viruses and bacteria. They train the body to fight harmful invaders by causing an immune response. Vaccines can use live or dead pathogens, parts of a pathogen, or mRNA to train the immune system to recognize and destroy harmful invaders. However, it is important to note that not all vaccines contain live viruses.
COVID-19 vaccines, for example, do not use any live virus. Instead, they use mRNA created in a laboratory to teach our cells how to make a protein that triggers an immune response. This mRNA enters the muscle cells and uses their machinery to produce a harmless piece of the spike protein, which is found on the surface of the virus that causes COVID-19. After the protein piece is made, our cells break down the mRNA and remove it from the body. Our immune system then recognizes that the protein does not belong there, triggering the production of antibodies and activating other immune cells to fight off the perceived infection. This process helps protect against future infection with the virus, without the vaccinated individual ever having to risk the serious consequences of getting sick with COVID-19.
Protein subunit vaccines, such as those used for COVID-19, contain pieces of the virus, specifically the spike protein. These vaccines also contain an adjuvant, which helps the immune system respond to the spike protein. Once the immune system knows how to respond, it will be able to react quickly and protect against the actual virus.
While most flu shots are made with inactivated or killed viruses, there are some flu vaccines that do contain live viruses. The nasal spray flu vaccine, FluMist, contains weakened live viruses. These viruses are designed to be too weak to cause illness in healthy individuals but strong enough to help build immunity.
In summary, while some vaccines may contain live viruses, it is important to note that many do not, including COVID-19 vaccines. Vaccines that do contain live viruses, such as certain flu vaccines, use weakened forms that are safe for most healthy individuals.
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Vaccines cannot infect you with a virus
Vaccines are one of the best ways to protect yourself from serious diseases. They are mostly used to prevent illness from viruses and bacteria. Vaccines cannot infect you with a virus, and this is true for all types of vaccines, including COVID-19 vaccines.
COVID-19 vaccines, for example, help our bodies develop immunity to the virus without us having to get the illness. They do not use any live virus. Instead, they put a weakened or inactivated germ into our bodies, or in the case of mRNA vaccines, they use mRNA created in a laboratory to teach our cells how to make a protein that triggers an immune response. This protein is the spike protein, found on the surface of the virus that causes COVID-19. Our cells break down the mRNA and remove it, leaving the body as waste.
Other vaccines may use a harmless virus (vector) to deliver the pathogen you want to be vaccinated against. For example, the HPV vaccine is made of reconstructed starry shields of the viruses, which cannot cause any harm to humans. These shields are called virus-like particles (VLPs) because they look like the HPV virus but do not actually come from it.
Overall, vaccines cannot infect you with a virus because they either use weakened or inactivated forms of the virus, or they use mRNA to teach our bodies how to fight the virus without ever exposing us to it.
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Vaccines do not interact with your DNA
Vaccines are designed to prevent serious illness from viruses and bacteria by training the body to fight harmful invaders, or pathogens, that cause disease. Vaccines work by using live or dead pathogens, part of a pathogen, or mRNA.
The COVID-19 vaccines, for example, help our bodies develop immunity to the SARS-CoV-2 virus without us having to get the illness. COVID-19 vaccines do not affect or interact with our DNA. They do not enter the nucleus of the cell where our DNA (genetic material) is located, so they cannot change or influence our genes.
MRNA vaccines, like the Pfizer and Moderna COVID-19 vaccines, introduce mRNA (messenger RNA) into muscle cells. The cells then make copies of the spike protein, which is found on the surface of the SARS-CoV-2 virus. The mRNA is quickly degraded and broken down into small harmless pieces by the cell. The spike protein is then displayed on the cell surface, triggering the immune system to produce antibodies and activate other immune cells to fight off what it thinks is an infection.
Protein subunit vaccines, like the Novavax COVID-19 vaccine, introduce the actual protein into the body to produce a similar immune response. These vaccines contain pieces (proteins) of the virus, such as the spike protein, and an adjuvant that helps the immune system respond to that spike protein. Once the immune system knows how to respond to the spike protein, it will be able to respond quickly to the actual virus spike protein and protect you against COVID-19.
While there has been some controversy over the lack of evidence supporting the claim that COVID-19 vaccines do not alter DNA, the CDC maintains that "it is not biologically possible for the vaccines to change or interact with an individual's DNA."
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Vaccines trigger an immune response
Vaccines are designed to trigger an immune response in the body, which helps to prevent illness from viruses and bacteria. Vaccines work by using live or dead pathogens, part of a pathogen, or mRNA to train the body to fight harmful invaders.
When a person gets vaccinated, their immune system is presented with antigens, which are usually a whole virus or bacterium, or a weakened or inactivated form of it. The immune system recognises the antigen as foreign, activating immune cells to produce antibodies and create a memory of the virus or bacterium. This process is known as immunisation, which is the body's way of protecting itself from the illness the vaccine is designed to prevent.
In the case of mRNA vaccines, the mRNA provides instructions for the body's cells to make a harmless protein that matches part of the virus. The immune system then recognises this protein as foreign, triggering an immune response. This response trains the immune system to fight off the virus, without the person ever having to risk the potentially serious consequences of getting sick.
Adjuvants are also added to vaccines to improve the immune response, making it stronger, faster, and more sustained. This helps the immune system respond quickly and effectively to the antigen, protecting the person from the disease.
Overall, vaccines trigger an immune response by presenting the body with antigens, either in the form of a whole or partial pathogen, or through the use of mRNA, which instructs the body to create antigens. This immune response involves the activation of immune cells and the production of antibodies, creating a memory of the antigen in the body to protect against future infection.
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Vaccines teach the body to fight harmful invaders
Vaccines are designed to train the body to fight off harmful invaders, such as viruses and bacteria, that can cause serious illnesses. They do this by imitating an infection and triggering an immune response, without causing a full-blown infection. This immune response involves the creation of antibodies, which are proteins produced by white blood cells to identify and neutralize foreign substances.
Vaccines introduce antigens into the body, which are unique parts of pathogens that the body recognizes as invaders. These antigens can be in the form of a whole virus or bacterium, a weakened form of toxins, or instructions for the body to make antigens itself (such as mRNA vaccines). The body then produces antibodies and activates other immune cells, such as B-cells and T-cells, to fight off what it perceives as an infection. This process is similar to how the body would respond if it encountered the actual disease-causing organism.
The first time the body encounters a pathogen, it adds special memory cells to its immune system. These memory cells keep a record of the harmful invader and know which tools (antibodies) to use to fight off a future infection. This is why vaccines provide protection against specific illnesses. When the body encounters the same pathogen again, the memory cells quickly respond, destroying the invader before it can cause sickness.
The development of memory cells through vaccination helps prevent serious illnesses and stops the spread of diseases. For example, COVID-19 vaccines help our bodies develop immunity to the virus without us having to get infected. The body learns to recognize the virus and produces antibodies to protect against future infections.
Overall, vaccines teach the body to fight harmful invaders by training the immune system to recognize and respond to specific antigens. This process involves the creation of antibodies and memory cells, which work together to protect the body from potential threats and prevent the spread of disease.
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Frequently asked questions
Antigens are unique parts of a pathogen that the body recognizes as foreign. Antigens are usually a whole virus or bacterium, a weakened form of toxins made by a bacterium, or a part of a virus or bacterium.
Vaccines contain one or more antigens to trigger an immune response. The immune system recognizes the antigen as foreign, activating immune cells and creating antibodies. This process trains the immune system to fight off the virus or bacterium.
mRNA vaccines use mRNA created in a laboratory to instruct cells to make a harmless protein that matches part of the virus. This protein is recognized as foreign by the immune system, which then creates antibodies and activates immune cells to fight off the virus.
Vaccines can contain a weakened or inactivated form of a virus, but they do not contain a live virus. Inactivated vaccines are killed in a lab using heat or chemicals and cannot cause illness. Live attenuated vaccines contain live viruses or bacteria that have been weakened, but they cannot cause disease.
