vaccinations

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

  It generally develops immunity to that pathogen
• Why is it problematic to catch a disease for the first time?

  It can range from unpleasant to lethal
• What is the purpose of vaccines?

  To expose us to pathogens without causing disease
• 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 one major 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 herd immunity?

  When enough people are immune to a pathogen
• How does herd immunity affect disease spread?

  The pathogen won't have people to spread to
• What happens if a few people aren't vaccinated in a herd immunity scenario?

  They're unlikely to catch 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?

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

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

  They are pretty rare