There are five types of white blood cells and Basophils is one of them. Basophils play an important part though they make a small portion of total white blood cells present in the body. Basophils are white blood cells and they are useful in dealing with allergic reactions. A lesser or a higher level of Basophils can cause several diseases and are harmful. To have the count of the Basophils in white blood cells, an absolute basophil count blood test is required. Basophils don't respond to bacterial or viral infections. They are capable of phagocytosis of antigen-antibody complexes.