The following "Web lab" simulates the potential spread of HIV through
a population of 10 - 30 people. Each participant begins with a virtual
sample of body fluid. You will choose the number of HIV+ people
within the population. HIV status is assigned randomly by the computer.
You will not know who is initially HIV+. A sample of this original
fluid, before mixing, is archived by the computer. Each participant
will exchange fluid with another participant chosen at random by
the computer. The computer will generate three rounds of fluid exchanges
and display the results.
Following fluid exchanges, the computer simulates an ELISA (enzyme-linked
immunosorbet assay) to determine which fluid samples are now HIV+
and displays the results. Next the detective work begins. Knowing
the HIV status of all participants, you should be able to narrow
down the list to a few individuals who may have been the original
carriers. You can perform an ELISA on fluid archived before the
mixes to determine who was initially HIV+.