Madison Clarke
Vaccines are biological agents that provide active immunity against a disease by mimicking an infection. This is achieved by exposing the body to a small amount of weakened or killed bacteria or viruses, which stimulate the immune system to create antibodies. Live-attenuated vaccines, for example, the measles, mumps, and rubella (MMR) vaccine, use a weakened form of the virus. On the other hand, a nerve impulse, also known as a nervous impulse, is a progressive physicochemical change in the membrane of a nerve fiber that occurs due to differences in electrical charge. This change enables the transmission of signals, such as sensations or instructions to act, from a receptor to an effector.
Characteristics and Values Table for Vaccines and Nerve Impulses
| Characteristics | Values |
|---|---|
| Vaccines Definition | A substance that exposes you to a small, safe amount of weakened or killed viruses or bacteria to boost your immune system and reduce the risk of infection |
| Types of Vaccines | Live (or attenuated), inactivated (or killed), biosynthetic, mRNA, subunit, toxoid, conjugate, nucleic acid |
| Examples of Live Attenuated Vaccines | MMR, Chickenpox, Cholera, Typhoid, Tetanus |
| Examples of Inactivated Vaccines | DTaP, Tdap, Flu shot, Polio, Rabies, Hepatitis A |
| Examples of mRNA Vaccines | COVID-19 (Pfizer, Moderna), SARS-CoV2 |
| Examples of Subunit Vaccines | Hepatitis B, HPV, Pertussis |
| Examples of Toxoid Vaccines | Diphtheria, Tetanus |
| Examples of Conjugate Vaccines | Haemophilus influenzae type B (Hib) |
| Nerve Impulses Definition | An electrical phenomenon resulting from a difference in electrical charge across the plasma membrane of a neuron |
| Nerve Impulse Characteristics | Similar to a lightning strike, Involves sodium and potassium ions, Maintained by the sodium-potassium pump, Transmitted across synapses through neurotransmitters |
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What You'll Learn
- Live virus vaccines use a weakened virus to expose the body to a small amount of the virus
- The measles, mumps, and rubella (MMR) vaccine is an example of a live virus vaccine
- Killed vaccines are made from a protein or other small pieces taken from a virus or bacteria
- mRNA vaccines contain the genetic code of the virus and do not contain a live virus
- Nerve impulses are caused by differences in electrical charge across the plasma membrane of a neuron
Live virus vaccines use a weakened virus to expose the body to a small amount of the virus
Vaccines help prevent infection by introducing a harmless piece of a particular bacteria or virus into the body, triggering an immune response. Most vaccines contain a weakened or dead bacteria or virus. However, some vaccines, like mRNA vaccines, do not contain any part of the bacteria or virus. Instead, mRNA vaccines use mRNA created in a laboratory to teach our cells to make a protein that triggers an immune response in our bodies.
Live virus vaccines, on the other hand, use a weakened virus to expose the body to a small amount of the virus. This approach allows the body to develop immunity without experiencing the illness. The weakened virus stimulates the body's immune system to produce antibodies and activate other immune cells to fight off the perceived infection. After vaccination, the body retains these antibodies, enabling a rapid response if exposed to the actual virus in the future.
It is important to note that live virus vaccines are not suitable for everyone. Individuals with weakened immune systems, long-term health problems, or those who have undergone organ transplants should consult their healthcare providers before receiving such vaccines. Additionally, live virus vaccines need to be kept cool and may not be suitable for use in regions with limited access to refrigeration.
While live virus vaccines have been traditionally used, the development of mRNA vaccines during the COVID-19 pandemic has offered a new approach. Unlike live virus vaccines, mRNA vaccines do not contain a live virus, eliminating the risk of causing disease in vaccinated individuals. mRNA vaccines have several advantages, including shorter manufacturing times and the absence of any live virus component, making them a promising advancement in vaccine technology.
In conclusion, live virus vaccines have been a conventional method of exposing the body to a small amount of the virus by using a weakened form of the virus. However, with the emergence of mRNA vaccines, there is now an alternative approach that does not require the presence of a live virus while still effectively triggering the desired immune response.
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The measles, mumps, and rubella (MMR) vaccine is an example of a live virus vaccine
The MMR vaccine is safe and effective at preventing measles, mumps, and rubella. Vaccines, like any medicine, can have side effects, but these are usually mild and go away on their own. There is no link between the MMR vaccine and autism. It is safe for breastfeeding women to receive the MMR vaccination, and breastfeeding does not interfere with the response to the MMR vaccine. The baby will not be affected by the vaccine through breast milk.
The MMR vaccine is approved by the United States (US) Food and Drug Administration (FDA) and indicated for the routine immunization of children and adolescents. The CDC recommends two doses of the MMR vaccine as the best way to protect against measles, mumps, and rubella. Children may get two doses of the MMRV vaccine instead, which protects against chickenpox as well. Vaccines have made these diseases much less common in the United States.
The MMR vaccine can be given to children who live with pregnant women or immunocompromised people. Studies have shown that the adapted viruses in the vaccine are not usually transmitted from the vaccine recipient to others. Even if the virus was transmitted, it is too weak to cause harm. The MMR vaccine is also safe for pregnant women in the case of a measles or rubella outbreak, as the potential benefits of vaccination outweigh the risks.
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Killed vaccines are made from a protein or other small pieces taken from a virus or bacteria
Vaccines are biological agents that provide active acquired immunity to a particular disease. They typically contain a weakened or killed pathogen, such as a bacterium or virus, or a protein or other small pieces taken from the pathogen.
Killed vaccines, also known as inactivated vaccines, are made from a protein or other small pieces taken from a virus or bacteria. They are designed to trigger an immune response in the body without causing an infection. The process involves inactivating or killing the pathogen so that it can no longer replicate and cause disease. This is achieved by treating the pathogen with chemicals, such as formaldehyde, or through other methods like heat treatment. Killed vaccines are safe for vulnerable individuals, including those with weakened immune systems, as they do not contain any live components of the pathogen.
An example of a killed vaccine is the influenza shot, which is updated annually to match circulating strains. It is created by growing inactivated viruses in chicken eggs or cell cultures, preserving their viral structures to enhance immune recognition. Another example is the whooping cough (pertussis) vaccine, which is made from a protein or other small pieces taken from the bacterium that causes the disease.
Killed vaccines work by introducing a harmless fragment of a pathogen, such as a protein subunit or a small piece of a protein, into the body. This can be done through various methods, including injecting the vaccine into the muscle or upper arm. Once inside the body, the immune system recognizes these foreign proteins or pathogen components and initiates an immune response. It produces antibodies, which are specialized proteins that can recognize and mark the pathogen for destruction. This immune response creates immunologic memory, allowing the body to respond rapidly and protect against future infections.
In addition to killed vaccines, there are also live attenuated vaccines that contain weakened forms of the pathogen. These vaccines provoke strong immune responses and can often provide lifelong immunity with one or two doses. However, they may pose risks for immunocompromised individuals, and pregnant women are advised against receiving them. Examples of live attenuated vaccines include the measles, mumps, and rubella (MMR) vaccine and the varicella (chickenpox) vaccine.
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mRNA vaccines contain the genetic code of the virus and do not contain a live virus
Vaccines help prevent infection by preparing the body to fight foreign invaders such as bacteria, viruses, or other pathogens. Most vaccines contain a weakened or dead bacteria or virus. However, mRNA vaccines do not contain the virus in any form or any infectious agent. They are tiny, synthetic pieces of RNA that only code for one protein on the virus.
MRNA vaccines provide the mRNA, and then the body's natural process of creating proteins takes over. An mRNA vaccine is created with great precision to carry a synthetic piece of mRNA into the cytoplasm, where it is translated by the ribosome to create the spike protein found on SARS-CoV-2. This mRNA cannot create any other protein than the spike protein that it is coded for, and there is nothing in the vaccination that could transport the mRNA into the nucleus.
The two mRNA vaccines – Moderna’s mRNA-1273 and Pfizer/BioNTech’s BNT162b2 – contain a small piece of the genetic code of SARS-CoV-2, the virus that causes COVID-19. This piece of genetic code, when injected, instructs human cells to create the unique spike protein that surrounds the virus. It does not contain the live virus, i.e., the part that takes over a cell, begins replicating over and over, and can be transmitted to other people.
MRNA vaccines are considered genetic vaccines because mRNA and DNA are both genetic material. However, mRNA vaccines cannot change your DNA. mRNA vaccines work by introducing a piece of mRNA that corresponds to a viral protein, usually a small piece of a protein found on the virus's outer membrane.
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Nerve impulses are caused by differences in electrical charge across the plasma membrane of a neuron
Vaccines do not contain live viruses. Instead, they introduce a harmless piece of a particular virus or bacteria into the body, triggering an immune response. For example, COVID-19 vaccines help our bodies develop immunity to the virus without causing the illness.
Now, onto nerve impulses:
Nerve impulses are electrical phenomena caused by differences in electrical charge across the plasma membrane of a neuron. This difference in electrical charge is maintained by the sodium-potassium pump, which uses energy in ATP to pump sodium ions out of the cell and potassium ions into the cell. This unequal movement of ions creates an electrical gradient across the cell membrane, known as the resting potential. When a neuron is not actively transmitting a nerve impulse, it is in this resting state, ready to transmit an impulse.
The nerve impulse itself is a sudden reversal of the electrical charge across the membrane of the resting neuron, known as an action potential. This reversal is initiated when the neuron receives a chemical signal from another cell, causing the gates in sodium ion channels to open. As a result, positive sodium ions flow back into the cell, causing the inside of the cell to become positively charged compared to the outside.
This change in charge creates an electrical current that travels rapidly down the axon membrane as an action potential, jumping from node to node in myelinated axons. At the end of the axon, neurotransmitter molecules are released and travel across the synapse to the next cell, carrying the nerve impulse forward. This process plays a crucial role in cell-to-cell communication, allowing signals to propagate along the neuron's axon and connect with other neurons or cells.
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Frequently asked questions
A nerve impulse is a progressive physicochemical change in the membrane of a nerve fibre that follows stimulation and serves to transmit a record of sensation from a receptor or an instruction to act to an effector. This occurs because of a difference in electrical charge across the plasma membrane of a neuron.
Some vaccines contain live, but weakened (or attenuated) viruses. The measles, mumps, rubella, chickenpox, and nasal spray flu vaccines are examples of vaccines that contain live viruses. However, not all vaccines contain live viruses. For example, mRNA vaccines do not contain live viruses.
The measles, mumps, rubella (MMR), chickenpox, and nasal spray flu vaccines contain live, weakened viruses.
