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Flowchart of participant enrollment and study design. “Negative” indicates that PolA and Tpp47 were negative by nPCR assay; “Positive” indicates that PolA and/or Tpp47 were positive by nPCR assay. &PolA and Tpp47 were positive in saliva from 9 patients. Abbreviations: ddPCR, droplet digital polymerase chain reaction; nPCR, nested polymerase chain reaction.
