Finally, we would like to underscore that all patients with PPH should be tested for HIV infection. Testing can no longer be based on a history of high-risk behavior, because the prevalence of HIV infection is steadily increasing in nontraditional risk categories, such as heterosexuals. In Switzerland, for instance, in 1991 17.3 percent of all new AIDS cases occurred in heterosexual patients.' Rudolf Speich, M.D., Rnlf]enni, M.D., Milos Opravil, M.D., and Erich W Russi, M.D., F.C.C.P., University Hospital; and Marlene Pfab, M.D., 'IHemlispital, Zurich, Switzerland REFERENCES

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Diagnosis of Mycobacterial Mediastinal Lymphadenopathy by Transbronchial Needle Aspiration 1b the Editor: 1 read with great interest the case report by Baron and Aranda, 1 which appeared in the December 1991 issue of Chest. In the past I was nearly daily fa