They were interested in the prevalence of atopy, an immunologic response that can be determined by pricking the skin with allergens such as pollen or cat hair and measuring the size of the welt that results.
Depending on the species of Leishmania that invades a host and on the host's immunologic response to the infection, one of three principal types of leishmaniasis can arise.
Vitiligo is usually a slowly progressive disorder that is probably the result of abnormal immunologic reactions against constituents of the body's own cells (autoimmunity).
The process is not confined to the skin, and the cause is not known, although an autoimmune basis is thought to be involved because of the associated immunologic abnormalities.
Streptococcal tonsillitis frequently precedes relapses, especially in children, and the mechanism in these cases is probably immunologic.
Within the general concept of an immunologic disorder, there is ample room for a variety of primary stimuli and of later immunologic disease-causing mechanisms.
Although the evidence for an immunologic cause of this form of glomerulonephritis is less certain than in other types, and the provoking antigen is unknown, paradoxically the disorder usually promptly resolves when the patient is treated with corticosteroids or other immunosuppressive drugs, and renal failure never occurs.
When a T cell encounters bacterial products, either directly or via presentation by a special antigen-presenting cell, it is sensitized to recognize the material as foreign, and, once sensitized, it possesses an immunologic memory.
Although most persons develop an immunologic reaction to scabies, acquired immunity is poor or nonexistent, and recurring attacks are common.
In 1931 two Australian researchers, Frank Macfarlane Burnet and Jean Macnamara, using immunologic techniques, were able to identify the different serotypes of the poliovirus.
