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Centers for Disease Control microbiologist David Cross was shown here in this 1983 photograph, conducting lymphocytic transformation tests (LTT) on lymphocytes acquired from AIDS patients. At this stage of the process, he was pipetting specimens into a microtiter plate. Lymphocyte transformation tests are especially useful when investigating those allergic reactions, which take over 24 hours to manifest symptoms, and are termed Delayed Allergic Hypersensitivity reactions.
Public Health Image Library
CDC, “LYMPHOCYTIC TRANSFORMATION TEST,” The Global Health Chronicles, accessed December 16, 2017, https://globalhealthchronicles.org/items/show/6895.