1. A method for analyzing infectious agents in an image, comprising: providing an image having a plurality of objects therein; identifying objects in the image; sorting the identified objects into groups; determining a radial density profile distribution of the identified objects; identifying asymmetrical objects that are formable from the radial density profile distribution; sorting the identified asymmetrical objects into groups; and identifying infectious agents among the sorted asymmetrical objects based on the radial density profile distribution of objects in a selected group of asymmetrical objects; exposing infectious agents to a pharmaceutical drug; sorting the infectious agents into groups after the exposure to the pharmaceutical drug; and analyzing a difference between the radial density profile distribution of infectious agents before the exposure with a radial density profile distribution of infectious agents after exposure to the pharmaceutical drug.