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Abstracts |

Christmas Disease and Color Blindness in the Amish.

Robert L. Wall, M.D., F.A.C.P.; John McConnell, M.S.; and Delma Moore, R.N., M.T.
Ann Intern Med. 1965;62(5):1088. doi:10.7326/0003-4819-62-5-1088_1
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The Amish are a religious sect having a stable inbred population unchanged in recent years by additions to the sect by immigration and rarely by non-Amish marriage. They represent a unique group for genetic study. Christmas disease (Factor IX deficiency) has been observed in this kindred as well as deutan color blindness.

A large kindred arising from a marriage of 1875, now numbering over 600 individuals, contains the Christmas disease patients. Over 500 of this family have been bled for assay of Factor IX by a modification of Ratnoff's partial thromboplastin method, tested for color blindness, and typed for the


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