“…Metronidazole is recommended in combination with b-lactam antibiotics (Sacco et al, 2019;Tay and Vasoo, 2022). In current research, the average duration of antibiotic use was as long as 2-4 weeks, and some severe patients were treated for 8-16 weeks (Sheehan et al, 2019;Gama et al, 2020;Tamura et al, 2020;El Chebib et al, 2020;Repper et al, 2020;Monroe and Amlie-Lefond, 2018;Dal Bo et al, 2019;Whittle et al, 2018;Rana et al, 2017;Sinatra and Alander, 2017;He et al, 2015;Creemers-Schild et al, 2014). In this case, to cover the anaerobic bacteria as well as some pathogenic or coinfected G-bacilli and streptococci, the broad-spectrum carbapenem antibiotics were initially used empirically.…”