Increased Host Species Diversity and Decreased Prevalence of Sin Nombre Virus
Figure. Results of the nonlinear regression analysis between species diversity (expressed as Simpson diversity index, Ds) and Sin Nombre virus prevalence among deer mice (Peromyscus maniculatus) at each of 5 parks in Portland, Oregon, USA. The best fit model was of the form Y = x / (ax + b), R2 of 0.9994, p = 0.00001. The figure represents a summary of the results in that it shows the averages of all the seasons, in all years, in each park (indicated by circles). A regression using individual seasons and parks shows the same results.