The five types of white blood cells are the followings: basophils, eosinophils, neutrophils, monocytes, lymphocytes.
Basophils, eosinophils, neutrophils, monocytes tear down attacking microorganisms and eliminate dead cells, while lymphocytes control the immune responses.
The alergic reactions and infections with parasites produce the increased levels of eosinophiles, while the increased levels of peripheral basophils show a chronic leukemia.
The chronic inflammations are associated with increased levels of monocytes, while in viral infections, the levels of lymphocytes are increased.
Neutrophils are the producer of an enzyme that crush bacterial cells and the increased levels of neutrophils are associated with bacterial infections.