Wisconsin EHD outbreak kills over 700 deer across three counties

Key points

• Over 700 dead deer have been reported in Washington County, with additional cases in Waukesha and Ozaukee counties.
• The Wisconsin Department of Natural Resources confirmed EHD in two tested deer from Washington County.
• EHD is caused by a virus spread by midges and causes high fevers, internal bleeding, and organ damage.
• The disease does not infect humans, and survivors develop immunity against future outbreaks.
• Local governments, such as Richfield, have had to divert public works staff to remove dead deer from residential areas.

Background

Wisconsin first detected EHD in 2002, with sporadic outbreaks occurring since, including a significant event in 2012 across eight counties. The state's deer population has recently reached a record 1.89 million, with Washington County alone estimated to have 16,200 deer. This current outbreak is notable for its early start in July and the high volume of reports compared to previous years.

How outlets are covering it

While all sources agree on the severity of the outbreak, they differ in their emphasis. USA Today focuses on the biological mechanics of EHD and its distinction from chronic wasting disease. WPR highlights the economic impact on hunters and landowners, noting that the current death toll is significantly higher than previous outbreaks. WISN provides a human element, detailing the distress of a West Bend couple who found four dead deer on their property in ten days. Jsonline.com emphasizes the logistical strain on local governments, such as Richfield, which had to use public works staff to remove carcasses from yards. WPR also notes that some reports may be duplicates, urging caution in interpreting the exact numbers.

Why it matters

The outbreak highlights the vulnerability of Wisconsin's deer population to diseases less common in the northern U.S. It also demonstrates the strain on local resources and the emotional toll on residents who rely on deer for hunting and wildlife viewing. Understanding EHD is crucial for managing wildlife health and preparing for future outbreaks, especially as warmer temperatures may allow midges to expand their range northward.

What to watch

The DNR is not planning additional testing within the known outbreak area but will test deer if reports come from distant locations. The outbreak is expected to end after the first hard frost, which kills the midges that transmit the virus. Residents are encouraged to report sick or dead deer to help monitor the situation. Surviving deer will develop immunity, which may reduce the impact of future outbreaks in the same areas.