Stewardship / Resistance Scan for Mar 24, 2017

News brief

Researchers report high prevalence of MDR bacteria in Myanmar

Researchers in Myanmar are reporting high prevalence of multidrug-resistant (MDR) gram-negative bacteria among bloodstream isolates from patients at hospitals in the country's largest city.

In findings published in Emerging Infectious Diseases, the researchers report that, of the 592 blood cultures processed from patients at three hospitals in Yangon from July 2014 to December 2014, 42 (7.8%) yielded gram-negative bacteria. Of the 42 gram-negative isolates, 34 were Enterobacteriaceae (20 Escherichia coli, 7 Klebsiella pneumoniae, 6 Salmonella enterica, 1 Enterobacter cloacae) and 8 were non-fermenting gram-negative bacilli.

Almost 80% of the Enterobacteriaceae isolates were drug-resistant. Twenty (59%) were identified as MDR (with resistance to at least three classes of antimicrobial drugs), and 7 (21%) were classified as extensively drug resistant (with susceptibility to two or fewer classes of antimicrobial drugs), but all MDR Enterobacteriaceae were susceptible to polymixins.

Phenotypic testing suggested the presence of an extended-spectrum beta-lactamase (ESBL) enzyme in 16 of the gram-negative isolates and carbapenemase enzyme in 6 of the isolates. CTXM-15 ESBL and NDM carbapenemase were the most prevalent mechanisms of resistance.

"The high proportion of ESBL- and carbapenemase-producing gram-negative bacteria among bloodstream isolates from hospitalized patients in Yangon raises concern for the treatment of patients with gram-negative sepsis and suggests a need to reduce selective pressure and control the spread of resistant organisms," the authors write.
Mar 23 Emerg Infect Dis research letter

 

New initiative launched to address antimicrobial resistance challenges

The American Society of Microbiology (ASM) has launched a new initiative to analyze and share information on the current state of antimicrobial resistance and identify opportunities to address drug resistance challenges across the microbial sciences.

The ASM venture aims to address a host of antimicrobial resistance issues and identify approaches to maximize the impact on human, animal, and environmental health. Among the issues identified by the initiative's steering committee are the need for expanded surveillance into how resistance is spread, the need for antimicrobial stewardship across settings, the need for more research on environmental reservoirs of resistance, and the need for more research and funding for rapid diagnostic tests and new antibiotics.

ASM says the new initiative will complement existing efforts to address antimicrobial resistance and provide a mechanism for advancing research projects.
Mar 24 ASM press release

News Scan for Mar 24, 2017

News brief

Eighteen more H7N9 cases reported in China

The Hong Kong Centre for Health Protection (CHP) said today that the mainland reported 18 more H7N9 avian flu illnesses, 2 of them fatal, from Mar 17 to Mar 23, according to a regular weekly update.

After an unusually large surge of cases in December, China's H7N9 cases peaked in February. Though cases are declining, the country continues to report a steady stream of infections from a number of provinces.

Illness-onset dates ranged from Mar 9 to Mar 15, with cases reported in nine provinces, though half were in Guangxi and Hunan. All of the patients are adults, ranging in age from 37 to 86. Eleven are men and seven are women.

Sixteen had a history of exposure to poultry or poultry markets, known risk factors for contracting the disease.

China has now reported at least 583 cases and at least 176 deaths in the fifth and biggest wave of H7N9 activity since the virus was first detected in humans in early 2013.
Mar 24 CHP statement

 

US flu activity slows further, CDC says

US influenza activity ebbed for the fifth straight week last week, with two new flu-related deaths in children, the Centers for Disease Control and Prevention (CDC) said in its weekly update today. Flu activity, though, has now remained elevated for 14 straight weeks.

Flu was geographically widespread in 36 states for the week ending Mar 18, the CDC said, the same as the week before. Ten states reported regional flu activity, down from 11 the previous week. The percentage of respiratory samples that tested positive for flu was 17.9%, down from 18.3% the week before. The proportion of outpatient visits for influenza-like illness (ILI) was 3.2%, down from 3.7% the week before but still well above the national baseline of 2.2% for this time of year.

Last week 12 states reported high ILI activity, down from 18 the week before. Nine states saw moderate ILI activity and 23 reported minimal activity. Seven of 10 regions noted ILI above baseline levels, the same as the previous week.

One marker that rose again was hospitalization rate for lab-confirmed flu, which climbed from 46.9 per 100,000 population to 50.4 per 100,000. Among those 65 and older, the rate rose from 214.0 to 228.6 per 100,000 population. In 2012-13, another season dominated by the H3N2 "A" strain, the overall hospitalization rate during this time of year was 41.3 per 100,000 population.

Both deaths in kids were caused by the H3N2 strain. The CDC has now confirmed 55 pediatric deaths this season. That compares with 111 for the entire 2013-14 season, 148 in 2014-15, and 89 last season.

For the week ending Mar 11, 60.5% of flu specimens were influenza A and 39.5% were influenza B, compared with 61.1% and 38.9%, respectively, the week before. Of the "A" strains that were subtyped, 95.7% were H3N2.
Mar 24 CDC FluView report
Mar 24 CDC summary of FluView findings

 

Initiative enlists farmworkers to fight foodborne disease

The Equitable Food Initiative (EFI) is a new effort to use produce workers to spot potential foodborne disease problems in the field and subsidize them for their work. According to Food Safety News, EFI has already caught the eyes of major retailers including Costco and Whole Foods Market.

Produce workers are often the first to come in contact with potential sources of food pathogens, including animal droppings, unhygienic equipment, or a lack of hand-washing stations. EFI certifies farms to reward (and not penalize) their workers for calling out any potential problems. In the past, farmworkers have said speaking out would have cost them their jobs.

A farm earns EFI certification when workers and management take classes on conflict resolution. So far, Costco and Whole Foods Market have agreed to pay more for EFI foods without raising the retail value, with profits going directly to farmworkers. EFI began in 2014 and in 2016 expanded into Mexico.

The CDC estimates that each year the country sees 48 million cases of food borne illness, which result in 128,000 hospitalizations and 3,000 deaths.
Mar 24 Food Safety News story

ASP Scan (Weekly) for Mar 24, 2017

News brief

Our weekly wrap-up of antimicrobial stewardship & antimicrobial resistance scans

Researchers report high prevalence of MDR bacteria in Myanmar

Researchers in Myanmar are reporting high prevalence of multidrug-resistant (MDR) gram-negative bacteria among bloodstream isolates from patients at hospitals in the country's largest city.

In findings published in Emerging Infectious Diseases, the researchers report that, of the 592 blood cultures processed from patients at three hospitals in Yangon from July 2014 to December 2014, 42 (7.8%) yielded gram-negative bacteria. Of the 42 gram-negative isolates, 34 were Enterobacteriaceae (20 Escherichia coli, 7 Klebsiella pneumoniae, 6 Salmonella enterica, 1 Enterobacter cloacae) and 8 were non-fermenting gram-negative bacilli.

Almost 80% of the Enterobacteriaceae isolates were drug-resistant. Twenty (59%) were identified as MDR (with resistance to at least three classes of antimicrobial drugs), and 7 (21%) were classified as extensively drug resistant (with susceptibility to two or fewer classes of antimicrobial drugs), but all MDR Enterobacteriaceae were susceptible to polymixins.

Phenotypic testing suggested the presence of an extended-spectrum beta-lactamase (ESBL) enzyme in 16 of the gram-negative isolates and carbapenemase enzyme in 6 of the isolates. CTXM-15 ESBL and NDM carbapenemase were the most prevalent mechanisms of resistance.

"The high proportion of ESBL- and carbapenemase-producing gram-negative bacteria among bloodstream isolates from hospitalized patients in Yangon raises concern for the treatment of patients with gram-negative sepsis and suggests a need to reduce selective pressure and control the spread of resistant organisms," the authors write.
Mar 23 Emerg Infect Dis research letter

 

New initiative launched to address antimicrobial resistance challenges

The American Society of Microbiology (ASM) has launched a new initiative to analyze and share information on the current state of antimicrobial resistance and identify opportunities to address drug resistance challenges across the microbial sciences.

The ASM venture aims to address a host of antimicrobial resistance issues and identify approaches to maximize the impact on human, animal, and environmental health. Among the issues identified by the initiative's steering committee are the need for expanded surveillance into how resistance is spread, the need for antimicrobial stewardship across settings, the need for more research on environmental reservoirs of resistance, and the need for more research and funding for rapid diagnostic tests and new antibiotics.

ASM says the new initiative will complement existing efforts to address antimicrobial resistance and provide a mechanism for advancing research projects.
Mar 24 ASM press release 

 

Review finds drug resistance is not just a problem with hospital infections

Originally published by CIDRAP News Mar 23

A new study in Clinical Infectious Diseases has found that antibiotic resistance has a significant clinical impact for patients with common infections managed in the community.

While much is known about the consequences of antibiotic-resistant infections in hospitalized patients, less is known about how antibiotic resistance affects clinical outcomes in common community-associated infections like urinary tract infections (UTIs) and respiratory infections. And because clinicians rarely report treatment failure from antibiotic resistance in these infections, there is a perception that antibiotic resistance doesn't have an effect on individual patients.

To get a better understanding of how antibiotic resistance can affect these conditions, the researchers set out to compare clinical outcomes between antibiotic-resistant and antibiotic-sensitive infections for patients with community-associated UTIs, respiratory tract infections, and skin and soft-tissue infections. To do that, they searched electronic databases for studies conducted in community settings that reported patient-level data on lab-confirmed infections, antibiotic resistance, and clinical outcomes.

The primary outcome of the study was clinical response failure. Secondary outcomes were re-consultation, further antibiotic prescriptions, symptom duration, and symptom severity.

The results of the 26 studies included in the review showed that, when compared with antibiotic-sensitive infections, clinical response failure was significantly more likely in patients who had antibiotic-resistant E coli UTIs (odds ratio [OR], 4.19), Streptococcus pneumoniae otitis media (OR, 2.51), and Streptococcus pneumoniae community-acquired pneumonia (OR, 2.15). In addition, patients with antibiotic-resistant E coli UTIs were found to be more likely to re-consult a healthcare professional and experience prolonged and more severe infections compared with patients who had antibiotic-sensitive infections. 

"Antibiotic resistance has worse implications for patients' illness burden in the community," the authors write. "These findings could usefully inform better dialogue between clinician and patient, guidelines and campaigns about the benefits and risks of antibiotic treatment."
Mar 20 Clin Infect Dis abstract 

 

Ocular specimens show little antimicrobial resistance

Originally published by CIDRAP News Mar 21

A new retrospective study from Mount Sinai Hospital showed low levels of antibiotic resistance and decreasing rates of methicillin-resistant Staphylococcus aureas (MRSA) rates in S aureus isolates taken from ocular samples.

This is one of the first studies to track antimicrobial resistance in the ophthalmology setting, where broad-spectrum antibiotics are often used to treat infections and prescribed before and after surgical procedures, the authors wrote in Antimicrobial Resistance and Infection Control. To conduct the study, the researchers tested ocular cultures collected between January of 2010 and December of 2015 at 25 inpatient and outpatient clinics within the Mount Sinai system.

A total of 540 bacterial organisms were gathered from 1,664 cultures, and 358 isolates underwent susceptibility testing. About 51% of isolates (182) were gram-positive, and S aureus was the most common gram-positive bacteria (62.1%). MRSA decreased during the study period, from 31% to 14% overall, but the drop was not consistent over the years nor statistically significant. Compared with methicillin-susceptible S aureus isolates, MRSA samples were much more resistant to fluoroquinolones, erythromycin, and trimethoprim/sulfamethoxazole (TMP/SMZ).

Streptococcus pneumoniae isolates showed reduced susceptibility to erythromycin. The most common gram-negative bacteria isolated were Haemophilus influenzae (26.1%) and Pseudomonas aeruginosa (23.9%); H influenzae isolates showed resistance to ampicillin and TMP/SMZ.

"Overall, antimicrobial resistance was infrequent for the Gram-negative and Gram-positive bacteria analyzed. While the MRSA isolates demonstrated increased resistance to multiple antimicrobial classes, this is expected for this pathogen," the authors concluded.
Mar 20 Antimicrob Resist Infect Control study

 

CDC reports 15 new drug-resistant Salmonella cases, ends investigation

Originally published by CIDRAP News Mar 20

The investigation into a multistate outbreak of multidrug-resistant (MDR) Salmonella Heidelberg infections tied to contact with dairy bull calves is now over after the pathogen sickened at least 36 people, hospitalizing 13, the Centers for Disease Control and Prevention (CDC) said today.

The update includes 15 new cases, including 5 hospitalizations, since the CDC first reported the outbreak on Nov 28, 2016. Illness-onset dates go back to Jan 27, 2015, with the latest being Jan 16 of this year. All but 8 of the patients, though, fell ill in June 2016 or later. Patients range in age from less than 1 year to 72 years, with a median of 18 years.

Ten states reported cases, with Wisconsin (15), Missouri (6), Minnesota (4), and South Dakota (4) having the most. No deaths were reported.

"This outbreak investigation is over," the CDC said. "However, infections in calves continue to be reported and people can still get a Salmonella infection from contact with livestock." The agency recommends washing hands thoroughly with soap and water immediately after contacting livestock or its surroundings, among other disease-prevention steps.

Among all 36 outbreak patients, 25 (69%) reported contact with dairy bull calves or other cattle before becoming sick. Some of the patients said they fell ill after their dairy bull calves became sick or died. The outbreak strain was identified in one patient's dairy calves.

All isolates tested from patients proved to be MDR. All five isolates tested were resistant to amoxicillin-clavulanic acid, ampicillin, cefoxitin, ceftriaxone, streptomycin, sulfisoxazole, and tetracycline and showed reduced susceptibility to ciprofloxacin. All, however, were susceptible to azithromycin, gentamicin, and meropenem. Four of the five isolates were also resistant to trimethoprim-sulfamethoxazole, and two of these were resistant to chloramphenicol and nalidixic acid.
Mar 20 CDC final update
Nov 28, 2016, CIDRAP News scan on original notice

 

Study: Following up on negative urine cultures aids antibiotic stewardship

Originally published by CIDRAP News Mar 20

Better follow-up of negative urine cultures substantially reduced the number of antibiotic days among pediatric urgent care patients, according to a new study in Pediatrics. The authors say the findings highlight empiric antibiotic treatment of urinary tract infection (UTI) in children as an important target for antibiotic stewardship.

For the study, researchers at Nationwide Children's Hospital (NCH)—an academic children's hospital in Columbus, Ohio, with a network of urgent care centers—set out to develop and implement a protocol for follow-up management on negative urine culture results. The purpose was to reduce inappropriate antibiotic exposure in patients with acute UTI at their urgent care centers. UTI is a common infection in children, but because physicians have to wait up to 48 hours for urine culture results, they frequently prescribe empiric antibiotic therapy based on symptoms. Prior to the study, NCH had no consistent mechanism in place to follow up on negative culture results and discontinue unnecessary antibiotic therapy.

The protocol standardized a process in which a nurse reviews the urine culture result and forwards a negative result to a physician, who then decides if antibiotic discontinuation is appropriate based on the results and clinical presentation. The nurse then notifies the patient or caregiver of the recommendation, and the physician documents the discontinuation of the antibiotics in the electronic medical record.

During the study period (July 2013 through December 2015), 910 patients received empiric antibiotic therapy for UTIs but had negative urine culture results. Among these patients, the rate of documented antibiotic discontinuation following a negative urine culture rose from a baseline mean of 4% to a mean of 84%, avoiding 3,429 (40%) of 8,648 antibiotic days prescribed. In addition, of the 46 patients who returned to an NCH urgent care center after antibiotic discontinuation, none were subsequently diagnosed as having a UTI.

"Our results highlight an essential opportunity in outpatient settings to introduce quality and stewardship measures for UTI management that will affect many patients and avoid a substantial number of antibiotic days," the authors write. 
Mar 16 Pediatrics study

 

New AMR diagnostic tool outperforms competitors in analysis

Originally published by CIDRAP News Mar 20

A new diagnostic tool that identifies antimicrobial resistance (AMR) genes directly from paired sequencing reads outperformed other diagnostic tools in a new study in bioRxiv, a preprint server.

The tool, called ARIBA (Antimicrobial Resistance Identification by Assembly), uses a combined mapping/alignment and targeted local assembly approach to identify AMR genes and their variants efficiently and accurately from paired sequencing reads. This approach is considered less limited than other widely used diagnostic tools that either align sequencing reads to a set of reference genes or search for reference gene matches in de novo assembled sequences.

In head-to-head comparisons with the diagnostic tools SRST2 and KmerResistance, ARIBA was found to be just as accurate in identifying resistance genes in Enterococcus faecium and Shigella sonnei but was also able to identify and classify variants involved in AMR. In addition, it was able to report the presence of variants, and interpret their consequences, in Neisseria gonorrhea isolates. ARIBA was also faster and required fewer computational resources.

ARIBA was developed by researchers from the Wellcome Trust Sanger Institute. 
Mar 18 bioRxiv abstract

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