This is a bar graph showing the proportion of Ross River virus tests undertaken by PathWest and St John of God Pathology that were positive by month and year from 2002 to 2012.  It shows that the proportion of tests that were positive was higher during the summer months but there was variability in the proportion of positive tests.  Over the winter months from 2002 to 2011, the proportion of positive tests from St John of God Pathology ranged from 0.4% in 2002 to 15% in 2009.  For PathWest the proportion of positive test results in the winter months ranged from 0% in 2003 to 6% in 2007.