Brett G. Mitchell

Prof. Dr. Brett G. Mitchell


Research Focus & Metrics

Academic Career Length

20Years (2007-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 November 2015 in Journal of Hospital Infection
Verified
Journal Article
Closed access
BMBrett G. Mitchell
Brett G. Mitchell
Professor StephanieProfessor Stephanie
Professor Stephanie
MAM. Anderson
M. Anderson
EDE. Dehn
E. Dehn

25 November 2015 in BMC Infectious Diseases
Verified
Journal Article
Open access
PDF file
OFOyebola Fasugba
Oyebola Fasugba
AGAnne Gardner
Anne Gardner
BMBrett G. Mitchell
Brett G. Mitchell
GMGeorge Mnatzaganian
George Mnatzaganian
During the last decade the resistance rate of urinary Escherichia coli (E. coli) to fluoroquinolones such as ciprofloxacin has increased. Systematic reviews of studies investigating ciprofloxacin resistance in community- and hospital-acquired E. coli urinary tract infections (UTI) are absent. This study systematically reviewed the literature and where appropriate, meta-analysed studies investigating ciprofloxacin resistance in community- and hospital-acquired E. coli UTIs. Observational studies published between 2004 and 2014 were identified through Medline, PubMed, Embase, Cochrane, Scopus and Cinahl searches. Overall and sub-group pooled estimates of ciprofloxacin resistance were evaluated using DerSimonian-Laird random-effects models. The I2 statistic was calculated to demonstrate the degree of heterogeneity. Risk of bias among included studies was also investigated. Of the identified 1134 papers, 53 were eligible for inclusion, providing 54 studies for analysis with one paper presenting both community and hospital studies. Compared to the community setting, resistance to ciprofloxacin was significantly higher in the hospital setting (pooled resistance 0.38, 95 % CI 0.36-0.41 versus 0.27, 95 % CI 0.24-0.31 in community-acquired UTIs, P < 0.001). Resistance significantly varied by region and country with the highest resistance observed in developing countries. Similarly, a significant rise in resistance over time was seen in studies reporting on community-acquired E. coli UTI. Ciprofloxacin resistance in E. coli UTI is increasing and the use of this antimicrobial agent as empirical therapy for UTI should be reconsidered. Policy restrictions on ciprofloxacin use should be enhanced especially in developing countries without current regulations.

1 April 2019 in The Lancet Infectious Diseases
Verified
Journal Article
Closed access
BMBrett G. Mitchell
Brett G. Mitchell
LHLisa Hall
Lisa Hall
NWNicole White
Nicole White
ABAdrian G Barnett
Adrian G Barnett
KHKate Halton
Kate Halton
NGNicholas Graves
Nicholas Graves

1 May 2016 in Journal of Hospital Infection
Verified
Journal Article
Open access
BMBrett G. Mitchell
Brett G. Mitchell
JFJ.K. Ferguson
J.K. Ferguson
MAM. Anderson
M. Anderson
JSJ. Sear
J. Sear
ABA. Barnett
A. Barnett
The emergence of antimicrobial resistance is of particular concern with respect to urinary tract infections, since the majority of causative agents are Gram-negative bacteria. Healthcare-associated urinary tract infections (HAUTIs) are frequently associated with instrumentation of the urinary tract, specifically with indwelling catheters. To evaluate the current incidence, mortality, and length of hospital stay associated with HAUTIs. A non-concurrent cohort study design was used, conducted between January 1st, 2010 and June 30th, 2014. All patients admitted to one of the eight participating Australian hospitals and who were hospitalized for more than two days were included. The primary outcome measures were the incidence, mortality, and excess length of stay associated with HAUTIs. From 162,503 patient admissions, 1.73% [95% confidence interval (CI): 1.67-1.80] of admitted patients acquired a HAUTI. Using a multi-state model, the expected extra length of stay due to HAUTI was four days (95% CI: 3.1-5.0 days). Using a Cox regression model, infection significantly reduced the rate of discharge (hazard ratio: 0.78; 95% CI: 0.73-0.83). Women were less likely to die (0.71; 0.66-0.75), whereas older patients were more likely to die (1.40; 1.38-1.43). Death was rarer in a tertiary referral hospital compared to other hospitals, after adjusting for age and sex (0.74; 0.69-0.78). This study is the first to explore the burden of HAUTIs in hospitals using appropriate statistical methods in a developed country. Our study indicates that the incidence of HAUTI, in addition to its associated extra length of stay in hospital, presents a burden to the hospital system. With increasing incidence of UTI due to antimicrobial-resistant organisms, surveillance and interventions to reduce the incidence of HAUTI are required.

21 November 2011 in Medical Journal of Australia
Verified
Journal Article
Closed access
MGM Lindsay Grayson
M Lindsay Grayson
PRPhilip L. Russo
Philip L. Russo
MCMarilyn Cruickshank
Marilyn Cruickshank
JBJacqui L Bear
Jacqui L Bear
CGChristine A Gee
Christine A Gee
IWIrene J Wilkinson
Irene J Wilkinson
Objective: To report outcomes from the first 2 years of the National Hand Hygiene Initiative (NHHI), a hand hygiene (HH) culture-change program implemented in all Australian hospitals to improve health care workers’ HH compliance, increase use of alcohol-based hand rub and reduce the risk of health care-associated infections.

17 March 2014 in Medical Journal of Australia
Verified
Journal Article
Open access
CSClaudia Slimings
Claudia Slimings
PAPaul Armstrong
Paul Armstrong
WBWendy D Beckingham
Wendy D Beckingham
ABAnn L Bull
Ann L Bull
LHLisa Hall
Lisa Hall
TRThomas V Riley
Thomas V Riley
To report the quarterly incidence of hospital-identified Clostridium difficile infection (HI-CDI) in Australia, and to estimate the burden ascribed to hospital-associated (HA) and community-associated (CA) infections. Prospective surveillance of all cases of CDI diagnosed in hospital patients from 1 January 2011 to 31 December 2012 in 450 public hospitals in all Australian states and the Australian Capital Territory. All patients admitted to inpatient wards or units in acute public hospitals, including psychiatry, rehabilitation and aged care, were included, as well as those attending emergency departments and outpatient clinics. Incidence of HI-CDI (primary outcome); proportion and incidence of HA-CDI and CA-CDI (secondary outcomes). The annual incidence of HI-CDI increased from 3.25/10 000 patient-days (PD) in 2011 to 4.03/10 000 PD in 2012. Poisson regression modelling demonstrated a 29% increase (95% CI, 25% to 34%) per quarter between April and December 2011, with a peak of 4.49/10 000 PD in the October-December quarter. The incidence plateaued in January-March 2012 and then declined by 8% (95% CI, - 11% to - 5%) per quarter to 3.76/10 000 PD in July-September 2012, after which the rate rose again by 11% (95% CI, 4% to 19%) per quarter to 4.09/10 000 PD in October-December 2012. Trends were similar for HA-CDI and CA-CDI. A subgroup analysis determined that 26% of cases were CA-CDI. A significant increase in both HA-CDI and CA-CDI identified through hospital surveillance occurred in Australia during 2011-2012. Studies are required to further characterise the epidemiology of CDI in Australia.