West Nile virus: 3 human cases reported in Northern Kentucky, health officials say

(Editor's note: The original version of this story wrongly stated the nature of the cases. They have been reported to health officials.)

Three human cases of West Nile virus have been reported in Northern Kentucky, according to health officials.

The Northern Kentucky Health Department said Thursday that the cases were all reported this summer. 

Residents in the area should take steps to prevent mosquito bites, which is how West Nile spreads. The virus does not spread by human-to-human contact.

The Health Department recommended using insect repellent and wearing long-sleeved shirts and long pants.

Only about 20 percent of infected individuals develop symptoms, which can include fever, headache, vomiting and diarrhea.

One in about 150 people suffer more serious, even fatal effects. 

Anyone who suspects they are infected should contact a medical professional, the Health Department advised.

Mosquitoes breed in standing pools of water, such as clogged gutters, poorly maintained swimming pools and open containers.

"(West Nile virus) has been in local populations of birds and mosquitoes for many years now," the Health Department said, "which is why individuals should take steps to protect themselves from mosquito bites through the summer and fall seasons."