Principles and methods of four micro-tests are described. Four tests, Chemotaxis, Migration Inhibition, Latex-particles-phagocytosis and NBT-reduction-capacity of in vitro stimulated leucocytes are combined in one testsystem. The System reported has the advantage of working with relatively small blood volumes and thus can also be applied in the pediatric group. The testsystem can well be used in an routine immunological laboratory. A detailed presentation of the test in an animal experiment concerning the immune response to Listeria infection under the influence of various levels ofdietary essential fatty acids is given.
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