Abstract:
Background:Staphylococcus aureus (SA) bacteremia often requires a long treatment duration with antibiotics to prevent relapse due to the ability of SA to establish reservoirs of infection in sites such as heart and bone. These metastatic sites of infection cannot be serially sampled to monitor the clearance of SA infection. This study aimed to establish a link between persistence of circulating SA deoxyribonucleic acid (SA-DNA) and tissue reservoirs in patients with SA bacteremia. Methods:A highly sensitive quantitative polymerase chain reaction was used to measure whole blood SA-DNA and plasma-derived SA cell-free DNA (SA-cfDNA) in a set of longitudinal samples from 73 patients with confirmed SA bacteremia and correlated with clinical features. Results:Blood SA-DNA was detected for longer than the duration of positive blood cultures. Longer duration of circulating bacterial DNA was observed in complicated SA bacteremia infections, such as endocarditis and osteoarticular infections, compared with uncomplicated bloodstream infections. In contrast, traditional blood cultures demonstrated similar time to clearance regardless of foci of infection. Plasma-derived SA-cfDNA showed concordance with blood SA-DNA levels. Baseline levels of SA-DNA were higher in patients presenting with greater clinical severity and complicated bacteremia. Conclusions:Prolonged levels of circulating SA-DNA in patients with complicated tissue reservoirs after clearance of blood cultures observed in this single-center study should be validated in additional cohorts to assess the potential utility for monitoring clearance of infection in patients with SA bacteremia.
journal_name
Open Forum Infect Disjournal_title
Open forum infectious diseasesauthors
Gutierrez J,Guimaraes AO,Lewin-Koh N,Berhanu A,Xu M,Cao Y,Kim J,Yan D,Chang JK,Dinoso JB,Koss CA,Clemenzi-Allen A,Chambers HF,Peck MC,Baruch A,Rosenberger CMdoi
10.1093/ofid/ofz090subject
Has Abstractpub_date
2019-02-26 00:00:00pages
ofz090issue
4issn
2328-8957pii
ofz090journal_volume
6pub_type
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