Before revision:  An analysis of the epidemic curves for Ebola, SARS, and Influenza A/H1N1 is also presented and described by a Gaussian function as well. Our findings demonstrate the universal character of\emph{ \emph{  well-established concepts in condensed matter Physics and their applications in different areas .
After revision:  Furthermore, in the frame of elementary percolation theory, we show that:\emph{ \emph{ well-established concepts in condensed matter Physics and their applications in different areas .