Biology
Updated: 9/13/2020
Biology

Storyboard Text

  • Vaccines are administered by a medical professional and contain dead or attenuated pathogens. They bypass the skin and are injected directly into the bloodstream.
  • The pathogens enter the body and are detected by the immune system. Phagocytic cells such as macrophages detect the pathogens and digest them in a process called phagocytosis.
  • When macrophages digest pathogens, they process the antigens and present them to b-cells which activate them against the pathogen.
  • These b-cells then divide into memory b-cells and plasma. The plasma cells produce thousands of virus-specific antibodies which attach to virus' antigens, disabling them.
  • If the body comes into contact with the specific pathogen in the future the memory b-cells will detect them and produce a strong immune response that the pathogen is quickly destroyed and the body is effectively immune to the virus.
  • This immunity isn't limited to the vaccinated individual. If a large percentage of the population are vaccinated then the un-vaccinated individuals in a population experience a level of artificial immunity as the virus is unable to effectively spread.