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City of Hamilton - Public Health Services
West Nile Virus (WNV) - Surveillance Statistics
Year-to-Year Comparison Table
WNV by Area in 2011
Positive Mosquito Pools in the 2011 Season (one or more of the same type of mosquito tested from a trap site)
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Number of Positive Pools |
Date Collected |
Date Reported Positive |
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8 |
August 3, 2011 |
August 6, 2011 |
|
5 |
August, 10, 2011 |
August 12, 2011 |
|
6 |
August 16, 2011* |
August 19, 2011 |
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2 |
August 23, 2011 |
August 26, 2011 |
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3 |
August 30, 2011 |
September 2, 2011 |
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1 |
September 7, 2011 |
September 9, 2011 |
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3 |
September 13, 2011 |
September 16, 2011 |
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3 |
September 20, 2011 |
September 23, 2011 |
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Total = 31 |
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*Trap set and collection dates moved from Tuesday/Wednesday to Monday/Tuesday for remainder of season starting week of August 16th
Catch Basin Treatment Dates
* Colour Scheme of Blue, White and Pink is used for the first three application rounds per season since 2007. A dot on the city street catch basins indicates treatment each round. This colour scheme matches most surrounding or Greater Toronto health units such as Halton, Niagara and Peel.
** Green dot used to indicate fourth round; however for 2011 the green dot indicates catch basin re-treatment. Public Works is conducting a catch basin cleaning program of all city street catch basins in co-operation with the treatment program. A red dot of paint indicates a catch basin was cleaned. A green dot will indicate re-treatment if re-treatment was required following cleaning.
*** For 2011 a fourth application round was added for increased control based on the rise of positive mosquito results this season. A dot of orange on the catch basins indicates the fourth round of treatment.
Footnotes:
1 Positive Mosquito Pools (pool = one or more same type of mosquito tested from a trap site)
2 Suspected cases, confirmed cases in parentheses.
3 No Equine Surveillance activities occurred.
4 All cases are confirmed.
5 Confirmed case is female, in her mid 60's.
Last updated: September 23, 2011
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