This article is taken from the monthly Sciences et Avenir n°938, dated April 2025.
Considering that the immune system is the defense mechanism put in place by our body's cells to react to the attack of a pathogen, it seems entirely logical that our microbiota participates in this defensive system. Indeed, we are made up of as many cells as we host bacteria, approximately 30,000 billion for each of these two entities.
English 
French