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Tennessee Department of Health: Tick, mosquito season now in full force

From Staff Reports

Ticks and mosquitoes are now out in force and looking for food. The meal of choice for both is blood, creating opportunities to spread a variety of serious illnesses such as Zika Virus Disease and Rocky Mountain spotted fever as they move from one bite victim to another.

Ticks often wait in tall grass or on bushes and similar vegetation for their next food source to arrive. They do not fly, but can attach to people as they brush against plants and trees. People can also get ticks from pets that may carry them. In Tennessee, the most dangerous illnesses spread by ticks are Rocky Mountain spotted fever and ehrlichiosis. In 2016, there were 581 cases of Rocky Mountain spotted fever in Tennessee; between 2004 and 2014, there were 16 deaths attributed to Rocky Mountain spotted fever in the state.

Rocky Mountain spotted fever and ehrlichiosis are preventable by avoiding tick bites, promptly removing ticks that do get on the skin and seeking medical care for a fever or rash after a possible tick bite. All common tick-borne diseases found in Tennessee can be easily treated with antibiotics if detected early. According to the Centers for Disease Control and Prevention, the antibiotic Doxycycline is the most effective treatment of Rocky Mountain spotted fever and ehrlichiosis. It is the antibiotic recommended for the treatment of most tick-borne diseases in patients of all ages.

Keeping grass trimmed and plants cropped around homes are good practices to prevent ticks. Wearing long sleeves and long pants, using Food and Drug Administration-approved insect repellents and treating clothing with permethrin can help prevent tick and mosquito bites.

Diseases spread by mosquitoes include West Nile Virus, Chikungunya, Zika virus disease and many others. Tennessee has already recorded two cases of West Nile Virus in 2017, which is unusual this early in the year. TDH continues to be concerned about the spread of Zika virus. While most people infected with Zika virus have very mild disease, infection during pregnancy can cause very severe problems including microcephaly, a condition causing a baby’s head and brain to be smaller than expected, and other neurologic and developmental problems.

In 2016, more than five dozen people in Tennessee were infected with Zika virus disease while traveling to other countries where the disease is common. TDH officials worked swiftly in each case to assure Zika would not be spread to others who live or work near those confirmed with the illness.

Travelers to areas where Zika is known to exist should understand the risk of contracting and transmitting the virus to others. For the most current updates on Zika from the CDC, visit

TDH and CDC recommend women and men with possible exposure to Zika virus consult with their health care providers about attempting to get pregnant.

TDH and CDC also recommend:

• Using insect repellants such as DEET, Picaridin, oil of lemon eucalyptus or IR3535 on your skin, following all label recommendations for usage. Pay particular attention to recommendations for use on children, and never apply any of these products around the mouth or eyes at any age. Consult your health care provider if you have questions.

• Using products containing permethrin, a highly effective insecticide, for clothing, shoes, bed nets and camping gear. Permethrin-treated clothing repels and kills ticks, mosquitoes and other pests and retains this effect after repeated laundering. Some commercial products are available pretreated with permethrin. As a caution, however, it is not to be used directly on skin.

• Tip and toss or drain and cover objects near your home or business that may contain water.  A mosquito can lay eggs in a container as small as a soda bottle cap. Repair screens on your home to prevent mosquitoes from entering.