Machine learning powered profiling: Rapid identification of Klebsiella Pneumoniae drug resistance from MALDI-TOF MS.

The early identification of drug-resistant phenotypes in Klebsiella pneumoniae is essential for effective clinical intervention, infection management, and the prevention of resistance development and spread. This study aimed to construct multiple machine-learning models to rapidly and comprehensively predict susceptibility to nine common antimicrobial drugs using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) data of K. pneumoniae. A total of 484 K. pneumoniae isolates from Zhejiang Rongjun Hospital were collected and tested for in vitro susceptibility to nine antibiotics. Six supervised learning models were developed and evaluated: Random Forest, eXtreme Gradient Boosting (XGBoost), Adaptive Boosting (AdaBoost), Logistic Regression, Multilayer Perceptron, and Support Vector Machine. Performance was assessed using test score, ten-fold cross-validation, accuracy, specificity, F1 score, AUROC, and 95 %CI. The models performed best for Amikacin and Co-trimoxazole, whilst exhibiting the poorest predictive efficacy for levofloxacin. AdaBoost and XGBoost achieved high predictive performance with AUROC values ≥0.8 for all nine antimicrobial drugs. The XGBoost model demonstrated strong performance and stability across evaluation metrics. SHAP analysis based on the XGBoost model identified key features such as 4517.5 ± 2.5 Da for Amikacin and 6022.5 ± 2.5 Da for Co-trimoxazole. The study concluded that analyzing MALDI-TOF MS data with machine-learning models can rapidly predict the antibiotic susceptibility of K. pneumoniae, reducing resistance detection time to 1-2 h and accelerating clinical decision-making.