Skin rash mold

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Beware of dead poison ivy: it still has plenty of urushiol, and will give the same effect. Compare the thick vines of grape: no rootlets visible, to the vines of poison ivy: so many rootlets that the stem going up a tree looks furry.

Poison ivy grows vigorously throughout much of North America, but particularly in the American Midwest. It can grow as a shrub up to about four feet tall, or as a groundcover four to ten inches high, or as a climbing vine on any and every support. Older vines on substantial supports send out lateral branches that may at first be mistaken for tree limbs.

The skin rash, featuring fluid-filled blisters and reddened areas that itch intensely, is caused by an irritating oil, urushiol. Urushiol binds to skin cell walls, changing their configuration, so that the body's immune system no longer recognizes these cells as belonging to the body and attacks them as foreign. Some people are susceptible to the rash, and others aren't, but reactions can change during a person's lifetime. Someone who was formerly not subject to it may become very sensitive, and vice versa.