4 Treatment and Prevention

Module 4


Assessments in Module 4 include one open response item and one formative assessment.

Open Response Item

You have been infected by a virus. Describe the two possible sequences of events your body would undertake to destroy the virus.

Cell-mediated response

  • Macrophages engulf a virus and display antigens on its surface
  • Helper T cells recognize these antigens and are stimulated to produce interleukin 1
  • Interleukin 1 causes helper T cells to divide and produce interleukin-2
  • Interleukin-2 stimulates killer T cells to divide
  • Killer T cells attack infected cells and destroy them
  • Macrophages clean up the mess

Humoral Response

  • Virus antigen binds to receptors on the surface of a B cell
  • This causes the secretion of antibodies specific to these antigens
  • Interleukin 2 stimulates B cells to divide and differentiate into memory B cells and more anti-producing B cells
  • Antibodies bind to viruses and viral infected cells
  • Macrophages clean up the mess

Formative assessment

Students select a disease on the Timeline of Infectious Diseases. Then, ask them to prepare a diagram, drawing, animation, cartoon or other means of displaying how the immune system mobilizes to ward off infection for their chosen pathogen.