The attached document is the most recent version, revised May 27, 2003, of the West Nile Virus - Preparedness and Prevention Plan for Ontario - 2003, a technical reference document for Ontario's 37 Health Units. The original document was issued with the same title in March 2003.

The May 27th edition of the province's West Nile Virus - Preparedness and Prevention Plan for Ontario - 2003 addresses the enhanced mosquito control measures under O. Reg. 199/03 and incorporates discussions from the working group of Health Unit representatives on implementation relating to the new Regulation.

Under O. Reg. 199/03, the Medical Officer of Health is required to conduct a risk assessment of the local conditions pertaining to WNv in the Health Unit. This risk assessment will identify where the required mosquito control activities (i.e., larviciding or adulticiding) can most effectively be applied, and further, requires the local municipality to undertake the measures necessary for mosquito control. The municipality is required to carry out specific mosquito control measures when directed by the medical officer of health.

Under the Regulation, the Medical Officer of Health is required to record, investigate, and report any confirmed or likely adverse or unintended human health effects attributed to mosquito control actions, and report any non-human environmental adverse effects to the Ministry of the Environment and/or other relevant local or provincial authorities.

The full document and appendices are available for download below:

MAIN DOCUMENT West Nile Virus Preparedness and Prevention Plan Ontario - 2003 30 pages | 194kb | PDF format

APPENDICES Appendix Ia Dead Bird Surveillance for West Nile Virus 2 pages | 18kb | PDF format

Appendix Ib Submission of Dead Birds for West Nile Virus Surveillance 8 pages | 133 kb | PDF format

Appendix II Permit Applicant Guide: Controlling Mosquito Larvae for Prevention and/or Control of West Nile Virus  [ Attachment ] 33 pages | 1.5Mb | PDF format

Appendix III Mosquitoes of Southern Ontario 6 pages | 131kb | PDF format

Appendix IV National Guidelines for Response to West Nile Virus 1 page | 49kb | PDF format

Appendix V Halton Regional Health Unit - Example of WNv Data Management - 2002 14 pages | 513kb | PDF format

Appendix VI Surveillance for West Nile virus (WNv) Illness - Case Definition 6 pages | 73kb | PDF format

Appendix VII Ontario Regulation 199/03 2 pages | 86kb | PDF format

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May 2003