Figure 1.

Hantavirus positive rodents. Scatter plot displaying along the horizontal axis the individual rodents captured in Singapore between 2006-2008 and along the vertical axis, absorbance units determined by ELISA using serum samples of indicated rodents. Dark blue triangles indicate R. norvegicus and open circles R. tanezumi. Other rodent species are pointed out as grey squares. Individual dots are shown as Large or Small data points indicating PCR positive or negative rodents, respectively. The calculated cut-off value (0.135) is indicated by a red arrow.