Insect-Borne Diseases

What are insect-borne diseases?

Insect-borne diseases are viral and bacterial illnesses from insect (bug) bites. The most common insects that pass on disease are mosquitoes, sand flies, ticks, and fleas. For example, mosquitoes are known for spreading the Zika virus, Yellow Fever, and Malaria. Ticks are known to spread Lyme disease and Rocky Mountain spotted fever.

Symptoms of insect-borne diseases

Symptoms will vary depending upon the type of insect that has bitten you. Common symptoms of insect borne diseases can include:

  • fever
  • chills
  • headache
  • sore muscles
  • skin rash
  • nausea
  • stomach pain

More serious symptoms can include:

  • difficulty breathing
  • the feeling that your throat is closing
  • swelling of your lips, tongue, or face
  • chest pain
  • a racing heartbeat that lasts more than a few minutes
  • dizziness
  • vomiting

What causes insect-borne diseases?

The diseases are caused by blood-sucking insects that infect humans or animals when they bite. You increase your risk of being infected by an insect when you are in areas where they gather. This would include tall grass, bushes, spots near still water (ponds), and places around the globe with heavy outbreaks.

How are insect-borne diseases diagnosed?

Your doctor can typically diagnose an insect-borne disease with a physical exam, a review of your symptoms, and a look at your recent travel destinations. Lab tests (blood and urine) can diagnose certain insect-borne diseases.

Can insect-borne diseases be prevented or avoided?

There are many actions you can take to reduce the threat of being infected by an insect. You should:

  • Stay out of tall grass and bushes.
  • Dress in long pants, long sleeves, and a hat if you must be in tall grass and bushes. Tuck your pants into long, white socks.
  • Wear light-colored clothing. This makes it easier to spot insects.
  • Use bug spray that contains the ingredient DEET.
  • Examine your skin and scalp when you get back in to check for bugs or bites. Always shower with plenty of soap after being in the outdoors.
  • Pay attention to outbreaks through the travel health notices posted by the Centers for Disease Control and Prevention (CDC). If you can, avoid travel to those places during outbreaks.

Insect-borne diseases treatment

As soon as you recognize a bite, clean it with soap and water. Pat it dry and apply rubbing alcohol to the bite. If you were bitten by a tick, remove the tick before cleaning the area. Use tweezers to slowly pull it off your skin. Be careful not to leave any part of the tick on your skin. Dispose of the tick. Wash your hands and the bite area with soap and water and wipe with alcohol. Apply an over-the-counter antibiotic cream to the bite area.

If you have any of the symptoms listed, see your doctor. Your doctor may give you a prescription for antibiotic medicine. Take the entire prescription. Your doctor may suggest other treatments that ease the symptoms. For example, over-the-counter pain medicine can relieve sore muscles and a fever.

Living with insect-borne diseases

Some insect-borne diseases cause long-term symptoms that affect your quality of life. Lyme disease, for example, can leave you with sore muscles and fatigue. Zika virus can be passed on to a baby and cause microcephaly (a condition that causes the head to be abnormally small) and an intellectual disability.

Questions to ask your doctor

  • How long does it take before a skin rash appears?
  • What if I don’t notice the bite for days? Is it too late to treat it?
  • How long should I wait to get pregnant if I’ve traveled near a Zika outbreak?
  • Is DEET dangerous for children?
  • Can my doctor remove a tick?