If aliens were to examine a human, they would think we were just slavish organisms designed to feed microbes and carry them around. Our bodies contain ten times more bacteria than cells , and there are an estimated 3.

Genes are the latest trend in nutrition, at least going by the burgeoning  legion   of Internet companies offering diets tailored to our genetic make-up.  These services are relatively affordable and simple to use.

If you can't kill them, trap them. Such is the fate that scientists are reserving to pathogenic bacteria, such as the infamous E. coli .