  A preliminary analysis of the temporal evolution of a population of
\emph{Peromyscus maniculatus} infected with Hantavirus Sin Nombre is made.
Ecological and epidemiological parameters are derived from the data, and they
are used as inputs for the analytical model presented in [Abramson and Kenkre,
Phys. Rev. E \textbf{66}, 011912 (2002)]. A prediction of the critical carrying
capacity and its associated critical mouse density is made, and the time series
is analyzed under the light of these. It is found that the sporadic
disappearances and reappearances of the infected phase correspond to the
bifurcation predicted by the model.
