A grass species producing pollen, which often induces hay fever, asthma and conjunctivitis in sensitized individuals. Johnson grass is a robust perennial native to North Africa, South Asia, and southern Europe. Johnson grass (Sorghum halepense) produces pollen which often induces hayfever, asthma and conjunctivitis in sensitized individuals. It is a grass of the sorghum family. It is native to the Mediterranean region, but grows throughout Europe and the Middle East. Introduced to the United States around 1830. It can now be found in every state except Minnesota, Maine, and Alaska. It reproduces by rhizomes and seeds. US Department of Agriculture Kansas Wildflowers and Grasses - Johnson grass page. Includes photos. Johnson grass, although regarded as a warm-season grass, has adapted well to colder climates. It is also referred to as Sorghum grass, and in the U.S., it usually flowers from May to July or, in the extreme south, from December to January. Though Johnson grass is primarily a hay and pasture grass, humans eat the seed, raw or cooked. Traditional allergy tests utilize the Skin Prick method (also known as a Puncture or Scratch test) to determine whether an allergic reaction will occur by inserting possible triggers into your skin using a needle prick. If you are allergic to the substance, you are forced to suffer through your body's reaction to the allergen.
No special preparation is needed for Allergy Johnson Grass Fluorescence Assay Skin. Inform your doctor if you are on any medications or have any underlying medical conditions or allergies before undergoing Allergy Johnson Grass Fluorescence Assay Skin. Your doctor depending on your condition will give specific instructions.
|All age groups
|A wheal and flare reaction of atleast 3mm indicates that the patient is allergic to the substance