In the article titled “In Vivo Resistance to Ceftolozane/Tazobactam in Pseudomonas aeruginosa Arising by AmpC- and Non-AmpC-Mediated Pathways” [1], a grant number was missing. The Acknowledgments section should be updated as follows.

We thank Morouge Alramadhan for technical support. We also thank the Universidad El Bosque for financial support for whole genome sequencing (Grant no. PCI-2017-9447). This work was supported by the National Institutes of Health (Grant nos. K08-AI113317 (TTT) and K24-AI121296 (CAA)), the Millennium Science Initiative of the Ministry of Economy, Development and Tourism, Government of Chile (JMM), and the Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT), FONDECYT 1171805, Ministry of Education, Government of Chile (JMM).