On July 1, Dr. Ana Elena Pérez Cobas joined the group with a grant from the Attraction of Research Talent of the Community of Madrid. Ana Elena studied Biology at the University of Valencia and defended her Doctoral Thesis cum laude with international mention entitled: "Effects of antibiotics and Clostridium difficile infection on the human gut microbiota" in 2015. Its development took place at the Foundation for the Promotion of Health and Biomedical Research of the Valencian Community (FISABIO). She has carried out stays and collaborations with several international groups. She has spent the last five years as a postdoctoral researcher in the Group of Biology of Intracellular Bacteria directed by Carmen Buchrieser, within the Department of Microbiology of the Institut Pasteur in Paris, France. The main research area of Ana Elena has been the ecology and evolution of the human microbiome in the context of bacterial infections, antibiotic pressure and other variables associated with hospitalization (dynamics throughout the infection process, therapies, recovery). The focus of the studies carried out is based on the use of multi-omics (a combination of "omics" such as metagenomics, metatranscriptomics, or the sequencing of marker genes). Over the next four years she will investigate the role of the gut and lung microbiome in the development, evolution, protection and transmission of antibiotic resistance in patients with hospital pneumonia.