Doing Its Part emphasizes immune function in allergies and illness. It describes autoimmune illness like MS or arthritis and also mentions cancer. It also shows how HIV weakens the immune system and "destroys helper T cells." The prevention of HIV, the importance of "wise choices," careful hand washing, and not sharing food or drink are all stressed in this program.

Originally released by Marsh Media, 2009. Streaming video file encoded with permission for digital streaming by Infobase on May 02, 2015.

Overactive Immune System (3:51); --HIV and AIDS (1:42); -- Avoiding Infectious Disease (2:57); .