Anachoresis is a Greek word meaning refuge. Ascoli uses the term for the description of a phenomenon which was observed before his time but the practical and multiplex application of which is his own contribution. He observed, in the course of his work on animals with the BCG vaccine of Calmette that a local inflammatory process is a center of attraction for various pathogenic micro-organisms which occur in other parts of the body. After the micro-organisms are drawn to the site of the local inflammation, they are rapidly destroyed. Ascoli uses the term "anachoresis" for this process of attraction and destruction through a focal inflammatory lesion.
Ascoli tried to demonstrate anachoresis clinically, histologically or bacteriologically, using BCG vaccine or other anachoresiogenic micro-organisms, in the following animals with the following bacteria:
In newborn calves against the causative organism of septic bronchopneumonia.
In rabbits against Bacillus cuniculi septicus.