Africa and the Atlantic Slave Trade. Before the 16th century, Europeans were not deeply involved in slave trading on the West African coast. However, there was some movement of African labour to Madeira and the Canary Islands by the early Portuguese explorers from 1470 onwards.
urticaria is not contagious you cannot pass it on to another person acute urticaria or acute hives when symptoms last less than 6 weeks it is called acute urticaria this is by far the most common type 25 % of people with acute urticaria also have angioedema swelling in the deeper layers of skin
Cold Urticaria (essentially meaning cold hives) is an allergy where hives (urticaria) or large red welts form on the skin after exposure to a cold stimulus.The welts are usually itchy and often the hands and feet will become itchy and swollen as well.old Urticaria (essentially meaning cold hives) is an allergy where hives (urticaria) or large red welts form on the skin after exposure to a cold stimulus.