Figure 2.
Here we illustrate how a animal pathogen may become a zoonotic human pathogen. Evolutionary studies suggest that such viral adaption to man is a progression of events, each step of which that may take multiple years. Illustration by Emily Robie, images from publicdomainvectors.org. Adapted from Dr. V. Stalin Raj’s graphic: http://www.iisertvm.ac.in/faculty/stalin/research_areas?%2Ffaculties%2Fstalin%2Fresearch_areas=.