Vaccines

• What is the main topic of the video?

  How vaccines work
• What happens to our immune system after exposure to a pathogen?

  It develops immunity to that pathogen
• Why do we only catch chickenpox once?

  Because we develop immunity after exposure
• What is the problem with naturally catching diseases?

  It can range from unpleasant to lethal
• What do vaccines contain?

  Weakened or inactivated pathogens
• How does the body respond to the weakened pathogens in vaccines?

  By producing antibodies and developing immunity
• How many diseases are we vaccinated against by primary school?

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

  They protect us from catching diseases
• What larger scale effect do vaccines have?

  They help control common diseases
• What is herd immunity?

  When enough people are immune to a pathogen
• What happens to a pathogen when enough people are immune?

  It won't have people to spread to
• What is a potential problem with vaccines?

  They don't always grant full immunity
• How do we check if an important vaccine has been effective?

  By checking after the injection
• What are common reactions to vaccines?

  Swelling around the injection site
• What severe reactions can vaccines cause?

  Fever or seizures in rare cases
• How common are bad reactions to vaccines?

  They are pretty rare
• What is the overall conclusion about vaccines?

  Pros generally outweigh the cons
• What are the pros and cons of vaccines?

  Pros:

  • Protect against horrible diseases
  • Control common diseases
  • Prevent epidemics through herd immunity

  
  

  Cons:

  • Not always grant full immunity
  • Possible bad reactions (swelling, fever, seizures)