Surveillance régionale de l'évolution de Staphylococcus aureus résistant à la méticilline (SARM) : quels résultats pour quels enseignements ?

[Impact of the COVID-19 pandemic context on the microbiological epidemiology and management of flexor sheath phlegmons]

Introduction

La pandémie liée au COVID-19 en France a récemment contribué à modifier le mode de vie des patients, ainsi que les modalités de prise en charge médicochirurgicale. Ces facteurs pourraient être la source de modification du spectre microbiologique, de la gravité ainsi que de l’évolutivité des phlegmons des gaines des fléchisseurs. L’objectif de cette étude était de faire un état des lieux épidémiologique et bactériologique de ces infections de la main et de comparer les données cliniques et microbiologiques avant et après la crise sanitaire due à la COVID-19.

Hypothèse

L’hypothèse de ce travail était que les phlegmons des gaines des fléchisseurs présentaient des caractéristiques microbiologiques spécifiques dans notre Centre hospitalier universitaire en milieu tropical, et que celles-ci ont également pu se modifier avec l’introduction récente de solution hydro-alcoolique liée à la pandémie COVID-19.

Matériel et méthodes

Entre janvier 2016 et décembre 2020, l’ensemble des données épidémiologiques préopératoires de nos patients ont été colligées. Le stade de gravité selon Michon, l’usage de solution hydro-alcoolique, ainsi que l’évolution clinique précoce, ont été recueillis. La cohorte était ensuite divisée en deux groupes afin de comparer les profils microbiologiques, la prise en charge et l’évolution clinique des patients en période pré-COVID de ceux en période post-COVID.

Résultats

Un total de 199 patients ont été inclus, 154 patients en période pré-COVID et 26 en période post-COVID. On retrouvait une majorité de SASM (58,3 %, n = 105) et 18,9 % de prélèvements négatifs (n = 34). Aucune différence statistiquement significative n’était retrouvée entre les deux groupes concernant les résultats bactériologiques. L’évolution clinique était jugée comme favorable dans 93,5 % des cas du groupe pré-COVID contre 80,8 % dans le groupe post-COVID (p = 0,046). L’utilisation de SHA (p < 0,0001) ainsi que le stade de sévérité initial selon Michon étaient significativement plus importants dans le groupe 2 (p = 0,04).

Discussion

La pandémie liée à la COVID-19 n’a pas montré de changement du spectre microbiologique, bien que l’usage de SHA se soit introduit dans nos vies quotidiennes. L’évolution clinique postopératoire était significativement moins favorable après l’apparition de la COVID et pourrait s’expliquer par une augmentation des cas ayant un stade de gravité initial plus avancé.

Niveau de preuve

IV, étude épidémiologique observationnelle.

Impact of the Covid-19 pandemic context on the microbiological epidemiology and management of flexor sheath phlegmons

INTRODUCTION

The COVID-19 pandemic in France has recently modified the patients' lifestyles, as well as methods of medical and surgical management. This could explain subsequent changes to the microbiological spectrum, the severity, as well as the scalability of phlegmons of the flexor tendon sheath. The objective of this study was to construct an epidemiological and bacteriological inventory of these hand infections, and to compare the clinical and microbiological data, before and after the COVID-19 pandemic.

HYPOTHESIS

The hypothesis of this work was that the phlegmons of the flexor tendon sheath presented specific microbiological characteristics in the tropical environment of our University Hospital Center, and that these characteristics could have changed with the recent introduction of hydro-alcoholic solution (HAS) associated to the COVID-19 pandemic.

MATERIAL AND METHODS

The preoperative epidemiological data of our patients were collected between January 2016 and December 2020. The stage of severity, according to the classification of Michon, the use of hydro-alcoholic solution, as well as the early clinical evolution were collected. The cohort was then divided into two groups in order to compare the microbiological profiles, the management and the clinical evolution of patients in the pre-COVID period with those in the post-COVID period.

RESULTS

A total of 199 patients were included, 154 patients in the pre-COVID period and 26 in the post-COVID period. We found a majority of MSSA (58.3%, N=105) and negative samples comprised 18.9% (N=34). No statistically significant difference was found between the two groups regarding the bacteriological results. The clinical course was judged to be favorable in 93.5% of cases in the pre-COVID group compared to 80.8% in the post-COVID group (p=0.046). The use of HAS (p<0.0001), as well as the initial stage of severity according to Michon, were significantly higher in group 2 (p=0.04).

DISCUSSION

The COVID-19 pandemic has not shown any change in the microbiological spectrum, despite the now daily use of HAS in everyday life. The postoperative clinical evolution was significantly less favorable after the onset of COVID and could be explained by an increase in cases with a more advanced initial stage of severity.

LEVEL OF EVIDENCE

IV, Observational epidemiological study.

Panton-valentine leukocidin-positive and toxic shock syndrome toxin 1-positive methicillin-resistant Staphylococcus aureus: a French multicenter prospective study in 2008

The epidemiology of community-acquired methicillin-resistant Staphylococcus aureus (CA-MRSA) differs from country to country. We assess the features of the ST80 European clone, which is the most prevalent PVL-positive CA-MRSA clone in Europe, and the TSST-1 ST5 clone that was recently described in France. In 2008, all MRSA strains susceptible to fluoroquinolones and gentamicin and resistant to fusidic acid that were isolated in 104 French laboratories were characterized using agr alleles, spa typing, and the staphylococcal cassette chromosome mec element and PCR profiling of 21 toxin genes. Three phenotypes were defined: (i) kanamycin resistant, associated with the ST80 clone; (ii) kanamycin and tobramycin resistant, associated with the ST5 clone; and (iii) aminoglycoside susceptible, which was less frequently associated with the ST5 clone. Among the 7,253 MRSA strains isolated, 91 (1.3%) were ST80 CA-MRSA (89 phenotype 1) and 190 (2.6%) were ST5 CA-MRSA (146 phenotype 2, 42 phenotype 3). Compared to the latter, ST80 CA-MRSAs were more likely to be community acquired (80% versus 46%) and found in young patients (median age, 26.0 years versus 49.5 years) with deep cutaneous infections (48% versus 6%). They were less likely to be tetracycline susceptible (22% versus 85%) and to be isolated from respiratory infections (6% versus 27%). The TSST-1 ST5 clone has rapidly emerged in France and has become even more prevalent than the ST80 European clone, whose prevalence has remained stable. The epidemiological and clinical patterns of the two clones differ drastically. Given the low prevalence of both among all staphylococcal infections, no modification of antibiotic recommendations is required yet.

[Evolution of resistance to antibiotics from 1997 to 2005 in the Reunion Island]

OBJECTIVE

The groupe hospitalier Sud Reunion (GHSR) is a 1130-bed hospital center, located on the Reunion Island, (Indian Ocean). We studied the profiles of antibiotic resistance in 2005, and compared those with previous data collected in 1997-1998, and with Metropolitan France and European data.

MATERIAL AND METHODOLOGY

All bacteriological strains isolated from diagnostic samples in 2005 were analyzed according to CA-SFM recommendations.

RESULTS

Since 1997, the rates of resistance to enterobacteria (betalactam, aminoside, quinolone, trimethoprim-sulfamethoxazole), Pseudomonas aeruginosa (ticarcillin, amikacin, ciprofloxacin, fosfomycin), Acinetobacter baumanii (amikacin) has decreased significantly. The rate of methicillin-resistant Staphylococcus aureus (1997: 3.6 %, 2005: 13.4 %) has increased but less than in Metropolitan France. The rate of Streptococcuspneumonia with decreased susceptibility to penicillin has increased (1997: 25.5 %, 2005: 42.9 %), as for Haemophilusinfluenzae which present an important increase of betalactam resistance (1997: 15.5 %, 2005: 37.8 %).

CONCLUSION

By comparing our data to 1997 and Metropolitan French data, it seems that the GHSR has managed to protect its hospital-based microbial ecology. However, community germs showed increasing resistance, probably because of an increasing antibiotic pressure, but with resistance rates often inferior to Metropolitan French ones.

Usefulness of antimicrobial resistance pattern for detecting PVL- or TSST-1-producing meticillin-resistant Staphylococcus aureus in a French university hospital

Several recent reports have suggested that community-associated meticillin-resistant Staphylococcus aureus (MRSA) clones, particularly those harbouring genes for Panton-Valentine leukocidin (PVL) or toxic shock syndrome toxin 1 (TSST-1), are increasingly responsible for infections in hospitals. Here, a retrospective study was carried out to investigate whether antimicrobial resistance patterns could be used to detect these pathogens in a French university hospital. Isolates were characterized by antimicrobial susceptibility testing, PCR profiling (PVL genes and tst), PFGE typing and multilocus sequence typing. Demographic and clinical data were collected from all patients. For PVL-positive MRSA, the typical antimicrobial resistance pattern (susceptible to fluoroquinolones, non-susceptible to fusidic acid, kanamycin resistant and susceptible to gentamicin and tobramycin) had a sensitivity of 77.8 % and a positive predictive value (PPV) of 100 %. For tst-positive MRSA, the antimicrobial resistance pattern (susceptible to fluoroquinolones and non-susceptible to fusidic acid) had a sensitivity of 100 % and a PPV of 72.4 %. These results suggest that phenotypic rules based on antimicrobial resistance patterns are potentially useful for the detection of PVL- and tst-positive MRSA isolates.

[Trends in Staphylococcus aureus antimicrobials susceptibilities: is methicillin still a relevant multiresistance marker?]

OBJECTIVE

Recent change was noted in S. aureus epidemiology, especially for none multiresistant methicillinresistant S. aureus (MRSA) and for multiresistant methicillin-susceptible S. aureus (MSSA). So, a six-year retrospective study was conducted to follow trends in antimicrobials resistance and to determine if methicillin remained a relevant multiresistant marker.

METHODS

All S. aureus isolates (duplicates excluded) isolated between 2001 and 2006 in a French 800-beds-teaching-hospital were included in the study.

RESULTS

Four thousand four hundred and fifty-five isolates providing from 3602 patients were identified between 2001 and 2006. MRSA rate and incidence for 1000 hospitalization-days significantly decreased from 34.7 to 22.6% and 1.3 to 0.6% respectively (p < 0.001). Significant decrease was observed for multiresistant MRSA (72.9 to 46.3%, p < 0.001), while no change was observed for multiresistant MSSA (2.9 to 3.4%). Among the 186 different antibiotic patterns isolated, four MRSA-phenotypes significantly decreased whereas two MSSA-phenotypes significantly increased. The main MRSA phenotype, resistant to kanamycin, tobramycin, macrolides-lincosamides-streptograminesB, and fluoroquinolones, significantly decreased from 11.9 to 5.9% (p < 0.001). Glycopeptide Intermediate S. aureus (GISA) phenotypes disappeared.

CONCLUSION

At this date, methicillin remains in our institution a relevant marker of multiresistance but trend is changing.