Vaccine Types and Mechanisms

The video discusses various types of vaccines, including live attenuated, inactivated, and subunit vaccines, explaining how each type works to train the immune system to recognize and fight pathogens. It also covers specialized vaccines like conjugate and toxoid vaccines. The video highlights new developments in vaccine technology, such as mRNA and vector-based vaccines, which are being tested for COVID-19. The goal of all vaccines is to prepare the immune system to combat infections effectively.

What is the primary goal of all vaccines?

• To provide immediate immunity

• To eliminate all bacteria and viruses

• To teach the immune system to recognize and respond to pathogens

• To cure diseases

Which type of vaccine contains a weakened form of a living virus or bacteria?

• Live attenuated vaccines

• Toxoid vaccines

• Subunit vaccines

• Inactivated vaccines

Why can't live attenuated vaccines be given to people with weak immune systems?

• They are too expensive

• They contain living pathogens

• They are not effective

• They require multiple doses

What is a characteristic of inactivated vaccines?

• They are only for bacterial infections

• They contain live pathogens

• They are similar to a natural infection

• They often require multiple doses

Which vaccine is an example of an inactivated vaccine?

• Tdap vaccine

• Injectable flu vaccine

• Chickenpox vaccine

• MMR vaccine

What do subunit vaccines contain?

• Whole pathogens

• Only parts of a virus or bacteria

• Dead bacteria

• Weakened viruses

Which component of the Tdap vaccine is a subunit vaccine?

• Polio

• Pertussis

• Tetanus

• Diphtheria

What is a feature of mRNA vaccines?

• They use the cell's machinery to produce antigens

• They use live viruses

• They contain bacterial toxins

• They are only for viral infections

Which companies were conducting trials for an mRNA vaccine against SARS-CoV-2 as of October 2020?

• Moderna and Pfizer

• Novavax and Merck

• Sanofi and GlaxoSmithKline

• Johnson & Johnson and AstraZeneca

What potential advantage do new vaccine technologies like mRNA vaccines offer?

• They are more expensive

• They require more doses

• They are harder to produce

• They may lead to safer and easier to produce vaccines