This is a bar graph showing the number of Ross River virus tests performed at PathWest (reference laboratory) and St John of God Pathology (a private laboratory) from the Perth metropolitan region per month from 2002 to 2012. It shows that there were a similar number of laboratory tests in the winter months from 2006 to 2009 as there were from 2004 onwards. Overlayed on the bar graph is a line graph of RRV notifications from Perth Metropolitan region. This shows that the changes in notification rates over time roughly follow the changes in numbers of tests over time.