Chapter 1: IntroductionAllergiesAn allergy can be defined as a reaction of your immune system due to an abnormally high sensitivity to certain substances, which does not bother most others people. People with allergies are often allergic to more than one thing. Substances that often cause reactions are ➢ Pollen ➢ Dust mites ➢ Mold spores ➢ Pet dander ➢ Food ➢ Insect bites ➢ Medicines Allergies can cause a number of different symptoms in the human body, for example; sneezing, itching, rash, runny nose, runny nose, or asthma. Allergies can range from minor to severe. Anaphylaxis is a symptom that can result from an allergy and be life-threatening. Food allergies and reactions to the venom of stinging insects such as wasps and bees are more often associated with these serious reactions. There is a whole series of tests which, however, require longer studies to see if children's allergies reappear in the months and years that follow. the treatment is stopped. Other studies suggest that a small skin patch can be applied to peanut allergy patients, which appears to safely and effectively protect against this sometimes fatal disease. This study involved 220 people, aged 6 to 55, all allergic to peanuts. The researchers tried different doses of the patch to see which was most effective. 110 people received patches containing peanut protein for a year, and the other 110 people received a placebo for the same duration. The results of this study showed the effectiveness of the patch since at the end of the year, more than 50% of people who wore the patch during the year were able to tolerate at least 1 gram of peanut.