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Ticks and Tick-Borne Diseases

Spring is a time of high tick activity in our coastal hills and residents should be aware when spending time outdoors. Santa Cruz County Mosquito and Vector Control (SCCMVC) staff and the California Department of Public Health (CDPH) collaborate to collect and test ticks in the County. At least 2% of Western black-legged ticks (Ixodes pacificus) tested in recent years contain the bacteria that can cause Lyme disease. In 2013, there were 5 reported cases of Lyme disease in Santa Cruz County, about the annual average (1.66 cases per 100,000 people).

The western black legged tick (Ixodes pacificus) and other human biting ticks found in Santa Cruz County such as the Pacific Coast tick (Dermacentor occidentalis) may carry other tick-borne diseases. Thus, SCCMVC plans to conduct surveys for these tick species and will submit them to the CDPH for testing. Because of tick-borne disease risk, residents are advised to take precautions to protect themselves from tick bites.

The tick starts out as an egg then matures into a larva, nymph and adult stage over several years. The nymph life stage is active in spring and summer, and is found on tree trunks, fallen logs, wooden benches and in leaf litter and feed on smaller animals, but they will also attach to people and pets. Adult ticks are active in fall when they climb to the tips of vegetation, often alongside trails or paths, and attach themselves to hosts, such as deer, pets or humans that brush against them.

Ticks feed by sticking their mouthparts into the skin of their host and sucking blood. Infections such as Lyme disease may be transmitted when the feeding tick is attached for at least a day. Immature ticks are about the size of a pinhead, and may be missed without careful examination.

The risk of being bitten by ticks may be reduced with the following precautions:

  • Wear long pants and long-sleeved shirts. Tuck pant legs into boots or socks and tuck shirts into pants.
  • Wear light-colored clothing so ticks can be easily seen.
  • Use a repellent registered for use against ticks; always follow label directions.
  • Stay in the middle of a trail and avoid logs, tree trunks, trail margins, brush and grassy areas.
  • Inspect yourself frequently while in tick habitat. Once out of tick habitat, thoroughly check your entire body and pets. Parents should examine their children, especially on the scalp and hairline.
  • Shower and launder clothes soon after activity in tick habitat.

To reduce the possibility of infection, remove attached ticks as soon as possible. Gently and firmly grasp the tick close to the head and pull it straight out, preferably with a tick tool or with fine-pointed tweezers. Save the tick for identification. Ticks should be kept alive by placing the tick into a sealable bag or container with a moist cotton ball in a refrigerator or cooler. The person removing the tick should wash their hands before and after removal and apply antiseptic to the bite area. Insecticides, Vaseline, lighted matches or gasoline should not be used to remove ticks because these techniques are ineffective or unsafe. Anyone who develops symptoms after being bitten by a tick should consult his or her physician.

Painful redness that occurs less than 24 hours after a tick bite and does not expand is likely a local allergic reaction to the tick bite. Early Lyme disease also has a rash but the Lyme disease rash appears three to 30 days after the tick bite, is often painless, and spreads to greater than 5 cm in diameter. The spreading rash can be accompanied by flu like symptoms, such as fever and body aches. Lyme disease is treated with antibiotics and most patients recover without complications, particularly when the disease is diagnosed early. If left untreated, Lyme disease can progress to arthritis and in some cases serious nervous system problems.

Individuals should consult their physician immediately if symptoms similar to those described for Lyme disease develop within one to several weeks after being bitten by a tick.

Information

Information

3/6/2015 Media Release

Prevent Tick Bites/Prevent Disease Pamphlet - provided by California Dept. of Public Health (CDPH) En español

Tick-borne Disease Information - CDPH