1. Skip to content
  2. Skip to main menu
  3. Skip to more DW sites
The lymphatic system, a part of the immune system in humans and an organ system that complements the circulatory system
Image: Ersin Arslan/Zoonar/picture allianceImage: Ersin Arslan/Zoonar/picture alliance

Immune system

The human immune system protects our bodies against germs, including bacteria, viruses, fungi and toxins. It's a complex network of organs, cells and proteins that us live healthy lives.