Brady Collins
Vaccines are designed to teach the immune system how to fight off certain kinds of germs and the serious diseases they cause. There are several types of vaccines, including inactivated vaccines, live vaccines, subunit vaccines, toxoid vaccines, and viral vector vaccines. However, not all suggested types of vaccines are legitimate. For instance, the term virulent vaccine is not a recognized type of vaccine as it implies harmful pathogens, contradicting vaccine principles.
| Characteristics | Values |
|---|---|
| Term | Virulent vaccine |
| Description | A vaccine made from a pathogen that retains its disease-causing potential |
| Safety | Not safe or effective for immunization |
| Other types of vaccines | Live attenuated, "killed", subunit, conjugate, inactivated, toxoid, recombinant vector, DNA, mRNA |
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What You'll Learn
Live attenuated vaccines
Some common examples of live attenuated vaccines include measles, mumps, rubella, yellow fever, varicella, and some influenza vaccines. The oral polio vaccine is another example, though it is no longer available in the United States due to concerns about its potential to revert to its original pathogenic form.
Despite their effectiveness, live attenuated vaccines do have some limitations. They are generally avoided during pregnancy and in patients with severe immunodeficiencies, as they may not be able to produce an adequate immune response. Additionally, they are fragile and must be stored and handled carefully, as they can be damaged or destroyed by heat and light.
Overall, live attenuated vaccines play a crucial role in disease prevention by providing long-lasting immunity with minimal doses, but they are also carefully administered to ensure the safety of vulnerable individuals.
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Inactivated vaccines
The method used for killing the pathogen in inactivated vaccines can vary. Whole pathogen inactivated vaccines are produced by killing the entire pathogen using heat, chemicals, or radiation, although only formaldehyde and beta-Propiolactone exposure are widely used in human vaccines. Split virus vaccines, on the other hand, are produced by using a detergent to disrupt the viral envelope. This technique is commonly used in the development of influenza vaccines.
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Subunit vaccines
Vaccines are available to prevent several dangerous and deadly diseases. Routine vaccinations for children, adolescents, teens, and adults have prevented countless cases of disease and saved lives.
One type of vaccine is the subunit vaccine, which contains purified parts of the pathogen that are antigenic or necessary to elicit a protective immune response. Subunit vaccines are made from a piece of a pathogen, not the whole organism, and do not contain any live pathogens. They are made from either the original pathogen or recombinantly. Recombinant vaccines use another organism to make the vaccine antigen.
The first subunit vaccine was produced in the mid-1980s to protect people from Hepatitis B. Other licensed recombinant subunit vaccines include Gardasil 9 (Human Papillomavirus), Flublok (influenza), and Nuvaxovid (Coronavirus disease 2019). Subunit vaccines are well-established technology and are suitable for immunocompromised individuals.
However, there are some drawbacks to subunit vaccines. They are relatively complex to manufacture compared to some other vaccines, and they may require adjuvants and booster shots. Additionally, the specific antigens used in a subunit vaccine may lack pathogen-associated molecular patterns, which are common to a class of pathogen. As a result, the immune response may be weaker than that elicited by other types of vaccines.
Despite these drawbacks, subunit vaccines are an important tool in the fight against infectious diseases. They are safe for injection and can be used to protect against a range of diseases, including tuberculosis and dengue.
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Toxoid vaccines
Vaccines are available to prevent several dangerous or deadly diseases, and they have saved countless lives. Different types of vaccines are designed to teach the immune system how to fight certain kinds of germs and the diseases they cause. Toxoid vaccines are one such type.
Toxoids are inactivated toxins, usually exotoxins, whose toxicity has been suppressed by chemical or heat treatment. Toxins are secreted by bacteria, but toxoids are not. They are altered forms of toxins. When used in vaccination, toxoids form immunological memory against the molecular markers of the toxoid. Toxoids are used because they induce an immune response to the original toxin or increase the response to another antigen. The toxoid markers and toxin markers are preserved. For example, the tetanus toxoid is derived from the tetanospasmin produced by Clostridium tetani.
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Viral vector vaccines
Several different viruses have been used as vectors, including influenza, vesicular stomatitis virus (VSV), measles virus, adenovirus (which causes the common cold), and vaccinia virus. These vectors are stripped of any disease-causing genes and sometimes genes that enable them to replicate, rendering them harmless. The genetic instructions for the antigen are stitched into the vector virus's genome. Once injected, the vector virus infects human cells and delivers the genetic code for the antigen, triggering an immune response without causing the disease.
There are two main types of viral vector-based vaccines. Non-replicating vector vaccines can only produce the vaccine antigen and cannot make new viral particles. On the other hand, replicating vector vaccines produce new viral particles in the infected cells, which then infect new cells to produce more of the vaccine antigen. The COVID-19 viral vector vaccines under development, including those by Johnson & Johnson and AstraZeneca with Oxford University, use non-replicating viral vectors.
While viral vector vaccines have been extensively tested and proven safe, they can cause minor side effects like headaches and fever due to the strong immune response they induce. Additionally, in rare cases, individuals may develop immunity to the vector virus itself, reducing the vaccine's effectiveness. This "anti-vector immunity" can make delivering a second dose challenging unless a different vector virus is used. Another challenge in producing viral vector vaccines is scalability, as traditional methods involve growing viral vectors in attached cells rather than free-floating cells, making large-scale production difficult.
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Frequently asked questions
The term "virulent vaccine" is not a recognized type of vaccine. The other options, such as live attenuated, killed, subunit, conjugate, inactivated, toxoid, and mRNA vaccines, are all established vaccine types. Virulent vaccines would imply harmful pathogens, which contradicts vaccine principles.
Live attenuated vaccines, or live vaccines, contain live pathogens from either a bacteria or a virus that have been weakened to trigger an immune response without causing disease. They create a strong and long-lasting immune response and can provide lifetime protection with just one or two doses.
Inactivated vaccines, or killed vaccines, use a killed version of the disease-causing germ. They usually don't provide immunity that is as strong as live vaccines, so multiple doses are often needed to build up immunity and offer full protection.
