Vaccines have been very useful in preventing viral diseases. In fact, they have lead to the eradication of smallpox from the world's human population. Most vaccines result in the host producing antibodies (proteins that bind to specific amino acid sequences) that bind to specific viral proteins. What might be a reason why a vaccine for HIV has been so difficult to develop?
Added by Kenneth M.
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This makes it difficult to target a specific viral protein with a vaccine, as the virus can quickly evolve to evade the immune response. Show more…
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1. These vaccines contain a version of the live virus or bacteria that has been weakened so that it does not cause serious disease in people with healthy immune systems. - live, attenuated vaccine - subunit vaccine - conjugate vaccines - inactivated vaccine 2. These types of vaccines target bacteria with polysaccharide coatings and are effective for these types of bacteria because they connect the polysaccharides to antigens that the immune system responds to very well. - conjugate vaccine - subunit vaccine - inactivated vaccine 3. Some researchers are working on developing a vaccine for COVID-19 that would put virus-like particles, such as empty virus shells that mimic the virus structure, into the human body. These are an example of what type of vaccine? - nucleic acid vaccines - virus vaccines - viral vector vaccines - protein-based vaccines - toxoid vaccine 4. Some researchers are working on developing a vaccine for COVID-19 that would use genetic instructions (in the form of DNA or RNA) for a coronavirus protein that prompts an immune response. These are an example of what type of vaccine? - protein-based vaccine - viral-vector vaccine - nucleic acid vaccine - virus vaccine
Madhur L.
A vaccine is a substance that contains all or part of a noninfectious version of a disease-causing organism. When the vaccine is administered to a person, the person's immune system attacks the noninfectious version of the organism and learns to recognize its surface proteins. The next time the immune system comes in contact with the same surface proteins, it has a defense already prepared in order to respond quickly to the invading organism. In this way, a vaccine gives people immunity to the disease-causing organism. Vaccines can be life-saving, but there have been a few cases of people catching a disease from the administered vaccine. How might genetically engineered organisms solve this problem?
Adi S.
Despite the evidence indicating how important vaccines are, some people have chosen not to vaccinate their children. Select the TRUE statements. A. Vaccines have been so successful that some people have forgotten how serious some childhood diseases can be. B. There is no need to vaccinate because most of the serious childhood diseases have been eradicated. C. The risks of vaccines outweigh their benefits. D. Diseases like measles, which can be prevented by vaccination, are reappearing in the United States because people fail to immunize their children. E. Children in the United States who are not immunized will not always be protected by herd immunity, despite the current anti-vaccine movement.
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