First Confirmation of West Nile Virus in Michigan of 2015
The Michigan Department of Health and Human Services (MDHHS) has confirmed Michigan's first West Nile virus activity of 2015.
West Nile virus has been found in crows collected in Ingham County.
Three nestling crows from Ingham County tested positive for the virus at Michigan State University. The birds were found dead in early June and submitted by the public to the Michigan Department of Natural Resources.
Birds naturally carry the virus in their blood. Mosquitoes become infected when they bite an infected bird.
Most birds show no symptoms of infection, but certain bird species, such as crows, blue jays and ravens, are more sensitive to the virus and are more likely to become sick and die when they become infected with the virus.
West Nile virus can cause serious neurological illnesses, such as meningitis and encephalitis. Symptoms include a high fever, confusion, muscles weakness, and a severe headache.
In 2014, there were 2,205 human cases of the virus and 97 deaths in the United States.
“While everyone should take steps to protect themselves, adults who are 50 and older have the highest risk of illness caused by West Nile virus,” said Dr. Eden Wells, chief medical executive for the MDHHS. “One bite from an infected mosquito can lead to a severe and possibly life-altering illness. Prevention is the key to protection.”
The mosquitoes that transmit West Nile virus are often referred to as the ‘house mosquito’ and may breed near people’s homes in storm drains, shallow ditches, retention ponds, and unused pools. As summer temperatures rise, mosquitoes and the virus develop more quickly.
“Recent heavy rains, combined with warm weather, have led to a lot of mosquito activity, and this can mean an increase in the use of insect repellents as we enjoy sports, backyard barbecues, camping and other outdoor summer activities,” said Gina Alessandri, MDARD’s Pesticide and Plant Pest Management Division Director. “Safe use of insect repellents is possible if you follow the directions listed on the bottle, especially when applying repellents on children.”
According to MDARD, people can stay healthy by using mosquito repellent products such as DEET, picaridin, or oil of lemon eucalyptus. Draining standing water, and making sure door and window screens will help keep mosquitoes out of the home. Also, consider using biological controls for small lakes and ponds you own, such as Bacillus thuringiensis israelensis (Bti), which is available at many stores.
When applying insect repellents, it’s important to keep the following guidelines in mind:
- Before applying repellent, read all label directions; not all repellents are intended to be applied to the skin.
- Repellents with low concentrations (10 percent or below) are effective and may be preferred in most situations. Start with a low-concentration product and re-apply if necessary.
- If applying repellents over a long period of time, alternate the repellent with one having another active ingredient.
"As with many wildlife diseases, vigilant observation and reporting from the public are critical in helping health and wildlife experts better understand and contain the transmission of West Nile Virus," said Steve Schmitt, veterinarian-in-charge at the DNR Wildlife Disease Lab. "We ask residents to contact us if they find sick or dead crows, blackbirds, owls or hawks, or any other bird exhibiting signs of illness."