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“0” at the center of the Los Angeles cluster study; black and white diagram, 13.5 cm high by 11 cm wide. Reprinted from David M. Auerbach, William W. Darrow, Harold W. Jaffe, and James W. Curran, “Cluster of Cases of the Acquired Immune Deficiency Syndrome: Patients Linked by Sexual Contact,” Amer. J. Med. 76 (1984): 487–92, 488. ©1984, with permission from Elsevier.
