Vaccination

• What is the main topic of the video?

  How vaccines work and their pros and cons
• 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 the first infection
• What is the benefit of vaccines in relation to disease exposure?

  They provide immunity without catching the disease
• How are the pathogens in vaccines treated?

  They are weakened or inactivated
• What do the weakened pathogens in vaccines still contain?

  The same antigens as the proper pathogens
• What do our bodies produce in response to vaccines?

  Antibodies
• 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 horrible diseases
• What larger scale effect do vaccines have on diseases?

  They help control diseases that were common
• What is an epidemic?

  A rapid spread of disease across a population
• What is herd immunity?

  When enough people are immune to a pathogen
• What happens to a pathogen when the host overcomes the disease?

  The pathogen disappears if no hosts remain
• What is a common problem with vaccines?

  They don't always grant full immunity
• What do we check after receiving important vaccines?

  If the vaccine has been effective
• What are some bad reactions to vaccines?

  Swelling, fevers, or seizures
• How common are severe reactions to vaccines?

  They are super rare
• What are the pros and cons of vaccines?

  Pros:

  • Protect against horrible diseases
  • Control common diseases (e.g., polio, smallpox)
  • Prevent epidemics through herd immunity

  
  

  Cons:

  • Not always grant full immunity
  • Possible bad reactions (e.g., swelling, fevers)