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Aerial treatment planned for 10 counties to kill mosquitoes, prevent EEE

MDHHS says health risks are not expected during or after spraying and that no special precautions are recommended.

Aerial mosquito treatment will be conducted in 10 high-risk counties throughout Michigan, including Kent, this month, the Michigan Department of Health and Human Services (MDHHS) announced Monday.

As of Sept. 13, Eastern Equine Encephalitis (EEE) has been confirmed in 22 horses in 10 counties. MDHHS says this is twice as many animal cases than Michigan had at the same time last year. While no human cases have been reported yet, EEE can cause serious and sometimes deadly illness in people.

EEE is one of the most dangerous mosquito-borne diseases in the United States. According to MDHHS, EEE has a 33% fatality rate in people who become ill. Last year, more than 25% of the nation’s EEE cases were diagnosed in Michigan.

In an attempt to prevent EEE and protect public health, MDHHS has decided to implement aerial treatment. This is scheduled to start the evening of Sept. 16, weather permitting. Treatment is scheduled for the following counties: Barry, Clare, Ionia, Isabella, Jackson, Kent, Mecosta, Montcalm, Newaygo and Oakland.

“We are taking this step in an effort to protect the health and safety of Michiganders in areas of the state where we know mosquitoes are carrying this potentially deadly disease,” said Dr. Joneigh Khaldun, MDHHS chief medical executive and chief deputy for health. “As people are spending more time outdoors because of COVID-19, they also need to be protecting themselves from mosquito bites.”

Aerial treatment is conducted by specialized aircraft and begins in the early evening hours into the following morning hours. The treatment is dispensed as very fine droplets that stay suspended in the air and kill adult mosquitoes on contact.

MDHHS says health risks are not expected during or after spraying and that no special precautions are recommended. The treatment is not expected to have any impact on surface water or drinking water.

Although the aerial treatment is considered necessary to reduce human risk, MDHHS says it will not eliminate it. Residents can continue to protect themselves from mosquito bites by:

  • Avoid being outdoors from dusk to dawn when mosquitoes carrying the EEE virus are most active.
  • Applying insect repellents containing the active ingredient DEET, or other U.S. Environmental Protection Agency-approved product to exposed skin or clothing, and always follow the manufacturer’s directions for use.
  • Wearing long-sleeved shirts and long pants when outdoors. Apply insect repellent to clothing to help prevent bites.
  • Maintaining window and door screening to help keep mosquitoes outside.
  • Emptying water from mosquito breeding sites around the home, such as buckets, unused kiddie pools, old tires or similar sites where mosquitoes may lay eggs.
  • Using nets and/or fans over outdoor eating areas.

Additional information about aerial treatment can be found at Michigan.gov/EEE.

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