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Fig. 6. —Graph illustrates three proposed disease patterns based on
chest radiographic findings: pattern A, peak to 50% improvement time
(PIT50) of more than 10 days; pattern B, PIT50 of 10 or
fewer days; and pattern C, minimal findings on chest radiographs during course
of entire disease. Three patients with pattern A had progressive deterioration
and died before onset of resolution (dotted curve).
