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What Are the Hazards?

Like any outdoor activity, orienteering does carry risks, however remote. These include sprained ankles, bee stings, snakes, mountain lions, wild pigs, and pot farmers. However, the most realistic and serious concerns are poison oak and tick-borne Lyme disease.

Photo gallery image (click to enlarge)

Photo gallery image (click to enlarge)

Poison Oak

This is a major problem in some Bay Area parks (http://baoc.org/maps/locales.php). If you don't know what poison oak looks like, the photos at the left show its spring and summer appearance, and how it turns red in the fall.

If you see any PO, go around it, not through it. Remember the motto: bright red leaves of three, let it be.

The standard PO precautions as as follows: Avoid touching the plant if at all possible. Wear long sleeves and long pants. As soon as possible after the event, preferably at the event site, remove all exterior clothes and shoes and put them in a plastic bag, and do not touch them again until they are washed. Use Tecnu at the event site, trying to rub it in on as much exposed skin as possible. Some people rinse it off, but I usually just take a towel and wipe off the excess oil after a few minutes, and then toss the towel in the contaminated bag. Put clean clothes on. When you get home, toss those clothes in the contaminated bag, reapply Tecnu before you shower. (You should do your tick search at that time.) Let the Tecnu work for a few minutes, and then thoroughly rinse it off in the shower, preferably with lukewarm water, not hot water (which opens your pores and lets in the PO oil).

If you are very allergic or were in some serious PO, you will probably still get some rash in the next 24 to 72 hours. As soon as you notice some small red bumps or itching, apply a prescription strength steroid cream to the affected area. Some people use Fluocinonide 0.05% cream. It is generic and relatively inexpensive, but you do need a doctor's prescription. Repeat application of the steroid cream every 3 to 4 hours as needed to beat down the rash.

If you follow these guidelines, most people are fairly comfortable. However, do not let it become a huge, red, weeping rash, for which you will have to see a physician and go on systemic steroids.

Be forewarned, poison oak is a chameleon—it can manifest itself as ankle-high plants, huge shrubberies, or vines winding around trees.

There are several products that claim to provide protection either before or after exposure (note, however, that their mention here does not constitute any endorsement):

For more information on this bane of orienteers, see the Poison Oak FAQ (http://www.knoledge.org/oak/), the Poison Ivy, Oak, and Sumac Information Center (http://poisonivy.aesir.com/), or the Tecnu Poison Ivy and Oak Guide (http://www.teclabsinc.com/tips-advice/facts-fiction/poison-ivy-and-oak-guide).

Lyme Disease

Transmitted by tick bites, Lyme disease is potentially quite serious. Evan Custer, our resident M.D., has written an excellent article on Lyme disease that covers incidence, symptoms, tests and treatment, and prevention.

Here are some comments about how to protect yourself from Lyme disease:

Wear long-sleeved pants and shirts, and do a careful tick search before or after showering. The tick that carries Lyme disease, the Western black-legged tick (Ixodes pacificus) is endemic in Tilden Park, and possibly others. It is a small tick, about the size of the head of a pin. If a tick has embedded itself in your skin, use a thin tweezers and pull it straight out (the procedure is described here (https://www.cdc.gov/ticks/removing_a_tick.html)). The earlier the tick is removed, the less likely you will be infected with the causative bacterium. You may want to place the tick in a small vial for identification later if desired. If you are a resident of Contra Costa County, Contra Costa Mosquito and Vector Control (http://www.ccmvcd.dst.ca.us/ticks.htm) will identify the tick for you free of charge if brought or mailed in. However, even if it is the species of tick that carries Lyme disease, only a small percentage of ticks are infected with the bacterium that causes the disease. More information about ticks and Lyme disease can be found in this file (PDF/48KB) (http://www.ccmvcd.dst.ca.us/PDF/TickTestQandA.pdf).

If you should develop a target-shaped rash over the next couple of weeks, that is generally considered to indicate that you have contracted Lyme disease, and should see a physician for appropriate treatment with antibiotics.