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Evaluate the feasibility of an efficacy randomised control trial (RCT) of paediatric peripheral intravenous catheter (PIVC) securement to prevent failure without resultant skin damage. A 3-arm, pilot RCT in an Australian paediatric hospital. Random assignment of 330 children to receive (i) bordered polyurethane dressing (BPU) + non-sterile foam (NSF), (ii) integrated securement dressing (ISD) + sterile foam (SF), or (iii) tissue adhesive (TA)+ NSF. Primary outcomes were feasibility and PIVC failure. Secondary outcomes included: skin/bloodstream infection; occlusion; infiltration; dislodgement; phlebitis; dwell; serious adverse events; acceptability and microbial colonisation of catheter tips, wound site, and foam. Most feasibility outcomes were confirmed; 98% of eligible patients consented, 96% received their allocated dressing and no patients were lost to follow up. Eligilbility feasibility (58%) was not met. 11 randomised patients did not require a PIVC. Of 319 patients receiving a PIVC (20,716 PIVC-hours), a significant reduction in PIVC failure was demonstrated with ISD, 31/107 (29%, p = 0.017) compared to BPU, 47/105 (45%). Although not statistically significant, compared to BPU, TA 34/107 (32%, p = 0.052) was associated with less PIVC failure. On Cox regression, no securement intervention significantly reduced PIVC failure. Older age (HR 0.92; 95% confidence interval [CI] 0.88–0.96; p = <0.01), no infection at baseline (HR 0.51; 95% CI 0.34–0.78) and insertion by vascular access specialist (HR 0.40; 95% CI 0.26–0.64) were significantly associated with reduced failure (p < 0.05). ISD and TA had reduced PIVC failure compared to BPU. A large efficacy trial to test statistical differences is feasible and needed. • Integrated securement devices (ISD) and tissue adhesive (TA) offer safe, acceptable options for paediatric PIVC securement. • The added securement of TA and ISD can prevent PIVC micromotion, limiting microorganism entry through skin insertion site. • Efficacy trial of paediatric PIVC securement is feasible and necessary to confirm the results of this study. [ABSTRACT FROM AUTHOR]

Extended-spectrum-beta-lactamase (ESBL)-producing Enterobacterales as a cause of community-acquired uncomplicated urinary tract infection (UTI) is on the rise. Currently, there are minimal oral treatment options. New combinations of existing oral third-generation cephalosporins paired with clavulanate may overcome resistance mechanisms seen in these emerging uropathogens. Ceftriaxone-resistant Escherichia coli and Klebsiella pneumoniae containing CTX-M-type ESBLs or AmpC, in addition to narrow-spectrum OXA and SHV enzymes, were selected from blood culture isolates obtained from the MERINO trial. Minimum inhibitory concentration (MIC) values of third-generation cephalosporins (cefpodoxime, ceftibuten, cefixime, cefdinir), both with and without clavulanate, were determined. One hundred and one isolates were used with ESBL, AmpC and narrow-spectrum OXA genes (e.g. OXA-1, OXA-10) present in 84, 15 and 35 isolates, respectively. Susceptibility to oral third-generation cephalosporins alone was very poor. Addition of 2 mg/L clavulanate reduced the MIC 50 values (cefpodoxime MIC 50 2 mg/L, ceftibuten MIC 50 2 mg/L, cefixime MIC 50 2 mg/L, cefdinir MIC 50 4 mg/L) and restored susceptibility (33%, 49%, 40% and 21% susceptible, respectively) in a substantial number of isolates. This finding was less pronounced in isolates co-harbouring AmpC. In-vitro activity of these new combinations may be limited in real-world Enterobacterales isolates co-harbouring multiple antimicrobial resistance genes. Pharmacokinetic/pharmacodynamic data would be useful for further evaluation of their activity. [ABSTRACT FROM AUTHOR]

Abstract: A major challenge for Streptococcus pyogenes vaccine development is the identification of epitopes that confer protection from infection by multiple S. pyogenes M-types. Here we have identified and characterised the distribution of common variant sequences from individual repeat units of the C-repeat region (CRR) of M-proteins representing 77 different M-types. Three polyvalent fusion vaccine candidates (SV1, SV2 and SV3) incorporating the most common variants were subsequently expressed and purified, and demonstrated to be alpha-helical by Circular Dichroism (CD), a secondary conformational characteristic of the CRR in the M-protein. Antibodies raised against each of these constructs recognise M-proteins that vary in their CRR, and bind to the surface of multiple S. pyogenes isolates. Antibodies raised against SV1, containing five variant sequences, also kill heterologous S. pyogenes isolates in in vitro bactericidal assays. Further structural characterisation of this construct demonstrated the conformation of SV1 was stable at different pHs, and thermal unfolding of SV1 is a reversible process. Our findings demonstrate that linkage of multiple variant sequences into a single recombinant construct overcomes the need to embed the variant sequences in foreign helix promoting flanking sequences for conformational stability, and demonstrates the viability of the polyvalent candidates as global S. pyogenes vaccine candidates. [Copyright &y& Elsevier]

• Efficacy of piperacillin/tazobactam (TZP) dosing regimens against ESBL-producing versus non-ESBL-producing E. coli. • TZP attained >3 log kill against ESBL- and non-ESBL-producing E. coli. • TZP standard regimens prevented the emergence of bacterial resistance. • Carriage of multiple β-lactamase genes with bla CTX-M-15 was observed in ESBL-producing E. coli. Extended-spectrum β-lactamase (ESBL)-producing Escherichia coli are a global public-health concern. We evaluated the pharmacodynamic activity of piperacillin/tazobactam (TZP) dosing regimens against ESBL-producing versus non-ESBL-producing E. coli. Five E. coli clinical isolates were obtained from Bangladesh. Broth microdilution and whole-genome sequencing (WGS) were performed on the five studied isolates. Three TZP-susceptible ESBL-producing and two non-ESBL-producing E. coli were exposed to TZP regimens of 4.5 g every 6 h (q6h) and every 8 h (q8h) as a 30-min infusion in a dynamic hollow-fibre infection model over 7 days. The extent of bacterial killing was ∼4–5 log 10 CFU/mL against ESBL-producing and non-ESBL-producing E. coli with TZP q6h and q8h regimens over the first 8 h. Bacterial killing was similar between two of three ESBL-producing (CTAP#168 and CTAP#169) and two non-ESBL-producing (CTAP#179 and CTAP#180) E. coli clinical isolates over the course of the experiment. ESBL-producing CTAP#173 E. coli was poorly killed (∼1 log) compared with two non-ESBL-producing E. coli over 168 h. WGS revealed that ESBL-producing E. coli isolates co-harboured multiple antimicrobial resistance genes such as bla CTX-M-15 , bla EC , bla OXA-1 , bla TEM-1 and aac(6′)-Ib -cr5. Overall, TZP q6h and q8h dosing regimens attained >3 log bacterial kill against all ESBL-producing or non-ESBL-producing E. coli within 24 h and maintained and prevented the emergence of resistance through the end of the experiment. In conclusion, TZP standard regimens resulted in similar bacterial killing and prevented the emergence of resistance against CTX-M-15-type ESBL-producing and non-ESBL-producing E. coli clinical isolates. [ABSTRACT FROM AUTHOR]

Ceftazidime-avibactam exhibits good in vitro activity against carbapenem resistant Klebsiella carrying OXA-48-like enzymes. We tested two hundred unique carbapenem resistant Klebsiella blood stream isolates (71% with single OXA-48-like carbapenemases, including OXA-48, n = 62; OXA-232, n = 57; OXA-244, n = 17; OXA-181, n = 5) that were collected as part of a multicentre study against ceftazidime-avibactam using Etest (bioMérieux, Marcyl'Étoile, France), 10/4 μg disc (Thermo Fisher) and Sensititre Gram Negative EURGNCOL Plates (Lyophilized panels, Sensititre, Thermo Fisher) with the aim of comparing the performances of the Etest and disc to that of Sensititre. Ceftazidime-avibactam MIC 50/90 was 2/>16 mg/L for the entire collection and was 2/4 mg/L for single OXA-48-like producers. Categorical and essential agreements between the Etest and Sensititre were 100% and 97%, respectively. Categorical agreement between the disc and Sensititre was 100%. Etest and 10/4 μg discs are suitable alternatives to Sensititre for ceftazidime-avibactam sensitivity testing for OXA-48-like producers. [ABSTRACT FROM AUTHOR]