To the Editor: Lynn E. DeLisi, M.D., et al. (1) reported a most interesting account of the reaction of New Yorkers to the events of Sept. 11, 2001, 3–6 months later. We wish to highlight one important finding they made, the higher risk faced by persons with psychiatric disorders when exposed to major terrorist events. The authors found that 63 individuals who were in previous psychiatric treatment, of the 1,009 adults that were interviewed, had significantly greater mean scores on the Davidson Trauma Scale. Earlier, also with regard to the events of September 11, Hoge and Pavlin (2) noted that based on behavioral health surveillance among military health system beneficiaries in the Washington, D.C., area, they found no increase in visits to behavioral health clinics in the 22 weeks between Sept. 11, 2001, and Feb. 9, 2002, compared with a similar period 2 years earlier.