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. 2025 Jun 19.
doi: 10.1007/s10096-025-05185-7. Online ahead of print.

A European survey on anaerobes from paediatric blood cultures: a comparative analysis with adults

Matteo Boattini  1   2 Arianna Aceti  3   4 Paulo Bastos  5 Viktoria Eirini Mavromanolaki  6 Sofia Maraki  7 Anastasia Spiliopoulou  8 Vasileios Kakouris  8 Yordan Kalchev  9   10 Ana Budimir  11 Branka Bedenić  11 Zana Rubic  12 Monica Licker  13 Corina Musuroi  13 Emese Juhász  14 Katalin Kristóf  14 Mateja Pirs  15 Ivana Velimirovic  15 Michael Berktold  16 Adriána Liptáková  17 Adriana Krajčíková  17 Pavel Drevinek  18 Anezka Gryndlerova  18 Monika Brzychczy-Wloch  19 Aldona Olechowska-Jarząb  20 Filip Bielec  21 Małgorzata Brauncajs  21 Edyta Podsiadly  22 Grażyna Nurzyńska  23 Patrycja Zalas-Więcek  24   25 Anna Michalska  24   25 Kristian Riesbeck  26 Hanna-Sofia Andersson  26 Tone Tønjum  27   28 Johan Christian Berild  28 Truls Michael Leegaard  29   30 Asger Nellemann Rasmussen  31 Kristian Schønning  31   32 Stefan Glöckner  33 Jürgen Rödel  33 Mohamed Tarek Badr  34 Georg Alexander Häcker  34   35 Denise Stark  36   37 Axel Hamprecht  36   37 Anna Dudakova  38 Jonathan Jantsch  38 Stefano Mancini  39 Chantal Quiblier  39 Damien Jacot  40 Gilbert Greub  40   41 Tiziano Ferniani  3 Simone Ambretti  3   42 Maddalena Calvo  43 Stefania Stefani  43   44 Rogier Schade  45 Erlangga Yusuf  46 Stefanie van Kleef-van Koeveringe  47 Sarah Vandamme  47 Alexia Verroken  48 Hector Rodriguez-Villalobos  48 François Duigou  49 Stéphane Corvec  49   50 Pauline Floch  51 Clémence Massip  51 Delphine Chainier  52 Olivier Barraud  52 Marie-Bossuète Louissaint  53 Assaf Mizrahi  53   54 Saied Ali  55 Maeve Doyle  55 Clarice Egan  56 Sinead McNicholas  56 Javier Colomina-Rodriguez  57 Ignacio Torres  57 Raul Gillaranz Luengo  58 Maria Nieves Larrosa Escartín  59   60   61   62 Maria Belen Viñado Perez  59   60   61   62 Ana Verónica Halperin  63 Sergio Fuente García  63 Rafael Cantón  63   62 Miguel Seruca  64 Vasco Santos Mendes  64 Dinah Carvalho  65 Rossana Cavallo  66   67 José Melo Cristino  65   68 Cristina Costa #  66   67 Gabriele Bianco #  67   69
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A European survey on anaerobes from paediatric blood cultures: a comparative analysis with adults

Matteo Boattini et al. Eur J Clin Microbiol Infect Dis. .

Abstract

Infections caused by anaerobes are common in children. However, limited data are available on bloodstream infections caused by these bacteria in Europe. A multicentre retrospective observational study was conducted over a 4-year period (2020-2023) across 44 European hospitals to analyze all anaerobes isolated from blood cultures. The study examined the epidemiology and antimicrobial resistance profiles of anaerobes identified in paediatric patients, comparing the findings with those observed in adults. Among the 14,527 total anaerobic isolates, 186 (1.3%) were detected from paediatric patients. These were predominantly Gram-positive (70%) and Gram-negative (22%) bacilli. The most prevalent species in paediatric patients were Cutibacterium acnes (24.7%), Schaalia odontolytica (9.7%), Actinomyces oris (8.1%), and Bacteroides fragilis (7.5%). Relative feature importance based on the mean SHAP (SHapley Additive exPlanations) values distinguished paediatric patients and adults based on their antibiotic resistance patterns with high accuracy. Compared to those from adult patients, Gram-positive bacilli detected in paediatric samples displayed higher resistance rates for meropenem (15% vs. 9%), metronidazole (52% vs. 24%), and vancomycin (27% vs. 6%), and lower resistance to benzylpenicillin (11% vs. 17%), amoxicillin/clavulanate (9% vs. 17%), and clindamycin (30% vs. 36%). Gram-negative bacilli in paediatric samples displayed lower resistance to benzylpenicillin (18% vs. 29%), piperacillin/tazobactam (26% vs. 33%), and clindamycin (20% vs. 27%), and they were highly susceptible to imipenem, meropenem, and metronidazole as those detected in adult patients. Bacteroides species detected in paediatric and adult patients displayed high resistance to piperacillin/tazobactam (33% vs. 39%) and clindamycin (38% vs. 29%), while they were highly susceptible to metronidazole. Compared to those from adult samples, Cutibacterium acnes in paediatric patients displayed lower resistance to benzylpenicillin (none vs. 15%) and clindamycin (17% vs. 29%). The comparison of species and susceptibility profiles of anaerobes detected in paediatric and adult patients highlighted the importance of reporting antimicrobial susceptibility surveillance data by age group.

Keywords: Bacteroides spp.; Cutibacterium spp.; Anaerobes; Antimicrobial resistance; Paediatrics; Sepsis.

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Conflict of interest statement

Declarations. Ethics approval and consent to participate: This study was conducted in accordance with the Declaration of Helsinki. Formal ethical approval was obtained by the institutional review board of the coordinating Centre (Città della Salute e della Scienza di Torino, Protocol No. 0048443). Consent for publication: Not applicable. Competing interests: The authors declare no competing interests.

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