THE DIAGNOSIS AND MENTAL RETARDATION OF ORIGIN IN SINGAPORE

SUMMARY Consideration. is gzven to the recognition. and prevention of carious types of mental retardation due to hazards of enoironmental origin. Obseroations are presented on congenital syphz"lzs, congenital toxoplasmosis, congenital rubella, Singapore kernicterus, Japanese B encephalitis, and tuberculous meningitis. Approprz"ate preoentiue measures have resulted z"n a sz"gnifz"cant reduction in. Singapore of these conditions, and hence z"n a decreasedfrequency of envz"ronmentally determined mental retardation. and related disa bilities.