immunity and vaccination

• White blood cells:

  • Look at antigen (unique protein on the surface)
  • Engulf the cell with foreign antigen
  • Break down the pathogen with enzymes
  • Antibody is a protein made to clump several pathogens together, then engulf them at once
  • Antitoxins remove toxins (made from bacteria that will make our body feel sick)
• Vaccines:

  • Dead or weakened pathogens are injected
  • White blood cells recognize the antigen from it
  • Create antibodies
• Herd immunity:

  • Achieved when a large number of the population is immune