poison ivy, oak and ivy - three plants, juice containing urushiol - irritating oily substance.Upon contact with the skin it causes an allergic reaction which leads to itching rash.The time interval between exposure and juice rash can take from several hours to several days.Skin contact with the juice can occur both directly and through objects previously come into contact with poisonous plants (garden tools, camping equipment, animal dander, etc.).
Contained in all parts of the plants and is retained even after their death.Poisonous substance rapidly penetrates deep into the skin.When burning plant is released into the air and can be inhaled by irritating the nasal passages and the lungs oropharynx.Often at the same time developing a very severe allergic reactions.
Initially, the skin is not sensitive to the urushiol.Sensitization develops gradually.Upon i
poison ivy, oak and ivy are not found on the territory of Russia.They grow mainly in North America (except Alaska and the southern desert areas).
Poison ivy can grow as a shrub or vine.Each page is composed of three leaflets.Poison oak looks like ivy, but most often occurs in the form of a bush, and its leaves resemble oak leaves normal.The lower surface of the leaves are much lighter than the top and covered with fuzz.Poison sumac is found in damp marshy areas.It has the shape of a tree-like shrub, each stem which contains 7 to 13 leaves, united in pairs.From harmless sumac poisonous plant is distinguished by hanging clusters of whitish berries.
diagnosis of contact allergies is placed on the basis of reports of the incident handling, a characteristic sequence of symptoms and the appearance of the rash.
If formed increased sensitivity to urushiol, allergy cure is no longer possible.However, you can get rid of its symptoms.To reduce itching should take a cool shower or bath, and applied to the skin Special soothing lotions, for example, based on calamine zinc.Severe allergic reactions involving the mucous membranes of the nose, mouth, eyes and genitals may require medical attention and the introduction of hormones.Immunotherapy (introduction of small doses of allergen with curative intent) if you are allergic to poisonous plants is not used.
After contact with poison ivy, oak or ivy rash usually lasts from 5 to 14 days.In more severe cases, it does not go up to a month or more.
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