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2011 West Nile Virus Activities

2011 Media Releases

2011 Dead Bird Surveillance

2011 Adult Mosquito Surveillance

2011 Human Surveillance

  • There were two (2) locally acquired cases of human WNV identified in Durham Region

2011 Equine Surveillance

Reports & Reference Material

Larviciding in 2011

Catch Basin Larviciding
Regionally and municipally-owned roadside catch basins throughout the Region were monitored for larval mosquito activity beginning mid-May 2011. Three catch basin treatments were conducted during the 2011 WNV season. The first catch basin treatment occurred in mid-June, with subsequent treatments occurring mid-July and mid-August. In order to maximize effectiveness, the larvicide treatment periods were separated by a maximum of twenty-one (21) days. A total of 158,053 roadside catch basins and a further 357 catch basins, located on Regionally or privately-owned property, were treated overall.

Standing Water Larviciding
Beginning mid-May 2011, areas of standing, stagnant were assessed as potential larval mosquito development sites. Where remediation of identified larval mosquito development sites was not possible, a biological larvicide was applied following a local risk assessment. A total of  3009 standing water site visits were conducted between May and September 2011, resulting in 731 larvicide treatments.