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ELISA results for 41 rhHtrA1-positive patient sera with synthetic peptides. P216-236 (A) and P285-308 (B) were tested with 41 rhHtrA1-positive sera from serial bleeding of 26 scrub typhus patients. The cutoff values for positive results are 0.221 and 0.237 (means of 10 negative controls plus 2 standard deviations) for P216-236 (A) and P285-308 (B), respectively. O.D., optical density.
