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West Nile virus

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West Nile virus (WNV) is a virus spread by mosquitoes. Learn how Halton Region Health Department is working to reduce the impact of WNV on its residents.

Halton Region and West Nile virus

West Nile virus (WNV) (external link)is a virus that is spread by mosquitoes.

Halton Region's Health Department works to reduce the impact of WNV on the health of residents by:

  • Informing and encouraging people to take steps to protect themselves from exposure to mosquitoes
  • Informing and encouraging people to reduce mosquito-breeding sites around their homes
  • Conducting monitoring and surveillance activities (e.g., setting mosquito traps) to detect the presence of West Nile virus in mosquitoes
  • Monitoring for the presence of West Nile virus in humans by ensuring prompt reporting of all cases of the disease by working with local physicians and hospitals
  • Larviciding (using pesticides to control the mosquito population) in catch basins and storm water retention ponds where mosquito larvae have been detected
  • Informing Halton Region residents about West Nile virus through:
    • Media releases
    • Pesticide use notices posted in local newspapers
    • Posting the latest data and information about WNV in Halton Region on our website

Surveillance activities

West Nile virus activity is determined by the surveillance of:

  • Mosquito larvae
  • Adult mosquito pools
  • Human cases

Protect yourself:

Wear long-sleeved shirts, long pants, socks and shoes when outdoors in the evening or early morning. Use an insect repellent approved by Health Canada.

Remove standing water:

Remove or change all standing water around your home to reduce potential mosquito breeding areas.

West Nile virus surveillance


Week of September 12 – September 18, 2021

Week of September 12 – September 18, 2021

Halton total

Burlington

Oakville

Halton Hills

Milton

# Mosquito Pools Positive for WNV Reported

2

0

0

0

2

# Probable Human Cases Reported

0

0

0

0

0

# Confirmed Human Cases Reported

0

0

0

0

0

# of Larvicide Applications to Standing Water

21

8 6 1 6

Year to date 2021

Year to date 2021

Halton total

Burlington

Oakville

Halton Hills

Milton

# Mosquito Pools Positive for WNV Reported

12

6

2

0

4

# Probable Human Cases Reported

0

0

0

0

0

# Confirmed Human Cases Reported

0

0

0

0

0

# of Larvicide Applications to Standing Water

596

241

165 92 98

2020 Results

Surveillance result

Halton total

Burlington

Oakville

Halton Hills

Milton

# Mosquito Pools Positive for WNV Reported

18

0

13

0

5

# Probable Human Cases Reported

0

0

0

0

0

# Confirmed Human Cases Reported

6

3

3

0

0

# of Larvicide Applications to Standing Water

479

75

109 192 103

2019 Results

Surveillance result

Halton total

Burlington

Oakville

Halton Hills

Milton

# Mosquito Pools Positive for WNV Reported

10

1

4

2

3

# Probable Human Cases Reported

1

0

1

0

0

# Confirmed Human Cases Reported

1

1

0

0

0

# of Larvicide Applications to Standing Water

440

77

132

114

117

Prevention and Control Measures

21 standing water sites were larvicided during the week of September 12 to September 18, 2021.

The Second round of larviciding of roadside catch basins is complete.

The Third round of larviciding of roadside catch basins has begun and the indicator colour is Orange.  

Larviciding of non-roadside catch basins in public parks is complete and the indicator colour is red.

For more information about West Nile virus, please contact Halton Region Health Department.

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