how a vaccine works

• What is the main topic of the video?

  The video discusses how vaccines work and their pros and cons.
• What happens to our immune system after exposure to a pathogen?

  It generally develops immunity to that pathogen and its diseases.
• Why do we only catch diseases like chickenpox once?

  Because our immune system develops immunity after the first exposure.
• What would be ideal regarding exposure to pathogens?

  To gain immunity without actually catching the disease.
• How do vaccines provide immunity?

  They contain weakened or inactivated pathogens that stimulate an immune response.
• What do weakened pathogens in vaccines still contain?

  They still contain the same antigens as the proper pathogens.
• What is the result of the immune response to vaccines?

  The body produces antibodies and develops immunity.
• How many diseases have vaccines been developed for by primary school age?

  More than a dozen diseases.
• What is the main pro of vaccines?

  They protect us from catching horrible diseases.
• How have vaccines helped on a larger scale?

  They have helped control diseases that were once common.
• What are some diseases that vaccines have helped control?

  Polio, smallpox, measles, and whooping cough.
• What do vaccines help prevent?

  They help prevent big outbreaks of disease, known as epidemics.
• What is herd immunity?

  When enough people are immune to a pathogen, it cannot spread effectively.
• How does herd immunity affect disease spread?

  It reduces the chances of unvaccinated individuals catching the disease.
• What is a common problem with vaccines?

  They don't always grant full immunity.
• What do we generally check after receiving an important vaccine?

  We check to see if the vaccine has been effective.
• What are some bad reactions to vaccines?

  Swelling around the injection site, fevers, or seizures.
• How common are bad reactions to vaccines?

  Bad reactions are pretty rare.
• How common are severe reactions to vaccines?

  Severe reactions are super rare.