Figure 2. Timeline to presumptive anthrax diagnosis, 11 patients with inhalational anthrax, 2001, United States. Abbreviations: Dx, diagnosis; OutPt, outpatient visit followed by discharge home; ER, emergency room visit followed by discharge home. *Diagnosis delayed—initial blood cultures were negative in three patients who received antibiotic therapy before culture specimens were collected, requiring use of special diagnostic tests. For patients 1–10, case numbers correspond to those in report by Jernigan et al. (13); patient 11 reported by Barakat et al. (14). A, timeline begins with presumed date of anthrax exposure, available for six patients. B, timeline begins with day of illness onset for five patients without recognized date of exposure.