Zoonotic Disease Seasonal Updates

Updates will be provided during the months of highest zoonotic incidence (typically June-September).

Rabies

Rabies has been found in bats, skunks, and a few other species in Weld County.  People and pets that have contact or suspected contact with a rabid animal should be assessed for risk of rabies and possible treatment.  

As of 7/7/21, six skunks have tested positive in 2021, in Weld County.

Prevention:  Always remember to vaccinate your pets for rabies 

2021 Animal Rabies Cases

If points do not appear on smaller map (above), hit your refresh button or View Larger Map.

View 2020 Map 

View 2019 Map

View 2018 Map

West Nile Virus

Mosquitoes are trapped in three zones in Weld County during the West Nile Virus (WNV) season (approximately June - September). See a map of these Sentinel Zones(PDF, 3MB).

Positive mosquito pools:

  • Week of 6/27/21
    • 1 from Zone 1
  • Week of 7/4/21
    • 1 from Zone 3
  • Week of 7/11/21
    • 1 from Zone 1
    • 1 from Zone 3
  • Week of 7/18/21
    • 3 from Zone 1
    • 1 from Zone 2
    • 1 from Zone 3
  • Week of 7/25/21
    • 2 from Zone 1
    • 3 from Zone 2
    • 3 from Zone 3
  • Week of 8/1/21
    • 3 from Zone 1
    • 4 from Zone 2
    • 1 from Zone 3
  • Week of 8/8/21
    • 5 from Zone 1
    • 5 from Zone 2
    • 5 from Zone 3
  • Week of 8/15/21
    • results pending


Positive Animals:

  • Week of 7/18/21
    • 1 raptor from Windsor area
    • 1 raptor from Severance area
    • 1 raptor from Kersey area
  • Week of 7/25/21
    • 1 horse from Greeley area
    • 1 horse from Keenesburg area
  • Week of 8/1/21
    • 1 horse from Kersey area
  • Week of 8/15/21
    • 1 horse from Erie area


Culex mosquitoes, the type of mosquitoes known to transmit West Nile virus, are declining but continue to remain above average for this time of year.  

 WNV Graph 8-16-21.png

Prevention practices are recommended!

  • Use insect repellant.
  • Wear long sleeves and pants to reduce mosquito bites.
  • Drain standing water near your home to prevent mosquito breeding.
  • Use screens on windows and doors to keep mosquitoes out of your home.

Plague

Recent cases of plague that have sparked some media attention include a human case of plague in a southwestern Colorado resident and a squirrel that tested positive in Jefferson County.

No cases of plague have been reported or diagnosed in Weld County in 2021.

Prevention:  Avoid contact with sick wildlife, protect yourself and your pets from fleas and ticks, and keep pets current on a veterinarian-approved flea and tick treatment.

Tularemia

No cases of Tularemia have been reported or diagnosed in Weld County in 2021.

Prevention:  Use insect repellent, wear gloves when handling sick or dead animals, and avoid mowing over dead animals.

Hantavirus

No cases of Hantavirus have been reported or diagnosed in Weld County in 2021.

Prevention:  Avoid exposure to mouse droppings and mouse-infested areas.