This test could reveal the health of your immune system

Scientists are getting a better handle on the complexities of how immunity works. Attentive readers might have noticed my absence over the last couple of weeks. I've been trying to recover from a bout of illness. It got me thinking about the immune system, and how little I know about my own immune health. The vast array of cells, proteins, and biomolecules that works to defend us from disease is mind-bogglingly complicated. Immunologists are still getting to grips with how it all works.