When your white blood cell count is low, you are at great risk for any illness or infection, which can spiral into a serious health threat. Or when the bone marrow stops making enough white blood cells to keep you healthy. This includes when something is destroying the cells more quickly than the body can replenish them. Your white blood cell count can be low for a number of reasons. They attack and kill parasites andВ cancer cells, and help with allergic responses. They secrete chemicals such as histamine, a marker of allergic disease, that help control the body's immune response.Д®osinophils. These small cells seem to sound an alarm when infectious agents invade your blood. They are the mostВ numerous type of white blood cell and your first line of defense when infection strikes.Д«asophils. They create antibodies to fight against bacteria, viruses, and other potentially harmful invaders. They have a longer lifespan than many white blood cells and help to break down bacteria.

Because some white blood cells have a short life of 1 to 3 days, your bone marrow is always making them. They are stored in your blood and lymph tissues. White blood cells are made in the bone marrow. When your body is in distress and a particular area is under attack, white blood cells rush in to help destroy the harmful substance and prevent illness. They flow through your bloodstream to fight viruses, bacteria, and other foreign invaders that threaten your health. Think of white blood cells as your immunity cells. They protect you against illness and disease. White blood cells are also called leukocytes. Your white blood cells account for only about 1% of your blood, but their impact is big. Your blood is made up of red blood cells, white blood cells, platelets, and plasma.

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