2.5 Assessment of the risk of bias in individual studies
One reviewer assessed the risk of bias using an adapted version of the method published by Higgins et al. (2019). Each study was rated as having or not (Yes or Not) risk of bias according to the following criteria: for all the studies, 1) samples that tested positive to NTS were confirmed by at least two diagnostic techniques; for the studies that reported serovars, 2) all the NTS-positive samples were serotyped and 3) the study presents a complete report of all the serovars that were found; for the studies that reported antimicrobial resistance, 4) all the NTS isolates were assessed for antimicrobial resistance, and 5) the study presents the complete antimicrobial resistance profile. For the studies that did not report the three outcomes, each criterion was scored as not applicable (NA). To summarize the results, we present the percentage of studies that had or not risk of bias per each criterion.