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https://www.selleckchem.com/screening/chemical-library.html Change in HIV DNA load from BL to T48 was -0.105 (IQR -0.384 to 0.121, P = 0.041) in the DT group and -0.132 (IQR -0.362 to 0.046, P = 0.005) in the TT group, with a comparable decline observed between the two groups (P = 0.821). A higher HIV DNA decline was associated with higher BL CD4/CD8 ratio. CONCLUSIONS Maintenance therapy with dolutegravir/lamivudine had the same impact as the triple regimen on HIV DNA levels after 48 weeks of treatment. These data seem to support the effectiveness of a dolutegravir/lamivudine dual regimen in controlling the magnitude of the cellular reservoir (www.clinicaltrials.gov, number NCT02836782). © The Author(s) 2020. Published by Oxford University Press on behalf of the British Society for Antimicrobial Chemotherapy. All rights reserved. For permissions, please email journals.permissions@oup.com.OBJECTIVES The antiviral zidovudine has been recently identified as an active drug against resistant Enterobacteriaceae, but prevalence of resistance to this compound remains unknown. The aim was to estimate the prevalence of clinical Escherichia coli isolates resistant to zidovudine and to decipher the mechanism of zidovudine resistance. METHODS We screened 537 isolates on zidovudine-containing agar plates and studied their thymidine kinase (tdk) gene sequences, the putative target involved in zidovudine resistance. Moreover, sequence analysis of 633 complete genomes of E. coli was performed to investigate mutation in the tdk gene. A comparative genomic analysis was done on an in vitro zidovudine-resistant mutant. RESULTS After screening on our medium containing 2.7 mg/L (10 μM) zidovudine, nine strains had a zidovudine MIC >26.7 mg/L. The gene was absent in three isolates, inactivated by an IS (IS1X2 and ISApl1) in two isolates and mutated in four isolates. A genomic analysis of 633 E. coli genomes showed heterogeneity of the tdk gene sequence, with 27 different sequences. Among

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