These maps reflect information for the 2011 Powassan Virus reporting season that has been submitted and verified to CDC through the week of April 17, 2012. These are considered the final USGS Powassan Virus Maps for the 2011 season.

These maps reflect information for the 2010 Powassan Virus reporting season that has been submitted and verified to CDC through the week of May 9, 2011. These are considered the final USGS Powassan Virus Maps for the 2010 season.

These maps reflect information for the 2009 Powassan Virus reporting season that has been submitted and verified to CDC through the week of May 4, 2010. These are considered the final USGS Powassan Virus Maps for the 2009 season.

These maps reflect information for the 2008 Powassan Virus reporting season that has been submitted and verified to CDC through the week of April 9, 2009. These are considered the final USGS Powassan Virus Maps for the 2008 season.

These maps reflect information for the 2007 Powassan Virus reporting season that has been submitted and verified to CDC through the week of May 20th, 2008. These are considered the final USGS Powassan Virus Maps for the 2007 season.

These maps reflect information for the 2006 Powassan Virus reporting season that has been submitted and verified to CDC through the week of May 1, 2007. These are the final USGS Powassan Virus Maps for the 2006 season.

These maps reflect information for the 2005 Powassan Virus reporting season that has been submitted and verified to CDC through the week of May 5, 2006. These are the final USGS Powassan Virus Maps for the 2005 season.

These maps reflect information for the 2004 Powassan Virus reporting season that has been submitted and verified to CDC through the week of June 21, 2005. These are the final USGS Powassan Virus Maps for the 2004 season.

These maps reflect information for the 2003 Powassan Virus reporting season that has been submitted and verified to CDC through the week of May 20, 2004. These are the final USGS Powassan Virus Maps for the 2003 season.