Ana Raquel Freitas


DL 57 contract (since 2018)
Personal Website
Phone number
+351 220428580
Researcher ID

Main publications

  • Freitas, AR; Tedim, AP; Novais, C; Coque, TM; Peixe, L. 2018. Distribution of putative virulence markers in Enterococcus faecium: towards a safety profile review. JOURNAL OF ANTIMICROBIAL CHEMOTHERAPY, 73, DOI: 10.1093/jac/dkx387
  • Freitas, AR; Novais, C; Duarte, B; Pereira, AP; Coque, TM; Peixe, L. 2018. High rates of colonisation by ampicillin-resistant enterococci in residents of long-term care facilities in Porto, Portugal. INTERNATIONAL JOURNAL OF ANTIMICROBIAL AGENTS, 51, DOI: 10.1016/j.ijantimicag.2017.11.007
  • Freitas, AR; Elghaieb, H; Leon-Sampedro, R; Abbassi, MS; Novais, C; Coque, TM; Hassen, A; Peixe, L. 2017. Detection of optrA in the African continent (Tunisia) within a mosaic Enterococcus faecalis plasmid from urban wastewaters. JOURNAL OF ANTIMICROBIAL CHEMOTHERAPY, 72, DOI: 10.1093/jac/dkx321
  • Freitas, AR; Sousa, C; Novais, C; Silva, L; Ramos, H; Coque, TM; Lopes, J; Peixe, L. 2017. Rapid detection of high-risk Enterococcus faecium clones by matrix-assisted laser desorption ionization time-of-flight mass spectrometry. DIAGNOSTIC MICROBIOLOGY AND INFECTIOUS DISEASE, 87, DOI: 10.1016/j.diagmicrobio.2016.12.007
  • Freitas, AR; Tedim, AP; Francia, MV; Jensen, LB; Novais, C; Peixe, L; Sanchez-Valenzuela, A; Sundsfjord, A; Hegstad, K; Werner, G; Sadowy, E; Hammerum, AM; Garcia-Migura, L; Willems, RJ; Baquero, F; Coque, TM. 2016. Multilevel population genetic analysis of vanA and vanB Enterococcus faecium causing nosocomial outbreaks in 27 countries (1986-2012). JOURNAL OF ANTIMICROBIAL CHEMOTHERAPY, 71, DOI: 10.1093/jac/dkw312
  • Novais, C; Tedim, AP; Lanza, VF; Freitas, AR; Silveira, E; Escada, R; Roberts, AP; Al-Haroni, M; Baguero, F; Peixe, L; Coque, TM. 2016. Co-diversification of Enterococcus faecium Core Genomes and PBP5: Evidences of pbp5 Horizontal Transfer. Frontiers in Microbiology, 7, DOI: 10.3389/fmicb.2016.01581
  • Freitas, AR; Novais, C; Read, A; Alves, V; Peixe, L. 2016. Co-infection with three linezolid-resistant Enterococcus faecium ST117 strain variants: what are we missing in diagnosis?. INTERNATIONAL JOURNAL OF ANTIMICROBIAL AGENTS, 47, DOI: 10.1016/j.ijantimicag.2016.03.011
  • Freitas, AR; Novais, C; Tedim, AP; Francia, MV; Baquero, F; Peixe, L; Coque, TM. 2013. Microevolutionary Events Involving Narrow Host Plasmids Influences Local Fixation of Vancomycin-Resistance in Enterococcus Populations. PLoS One, 8, DOI: 10.1371/journal.pone.0060589
  • Freitas, AR; Coque, TM; Novais, C; Hammerum, AM; Lester, CH; Zervos, MJ; Donabedian, S; Jensen, LB; Francia, MV; Baquero, F; Peixe, L. 2011. Human and swine hosts share vancomycin-resistant Enterococcus faecium CC17 and CC5 and Enterococcus faecalis CC2 clonal clusters harboring Tn1546 on indistinguishable plasmids. JOURNAL OF CLINICAL MICROBIOLOGY, 49(3), DOI: 10.1128/JCM.01750-10
  • Freitas, AR; Novais, C; Correia, R; Monteiro, M; Coque, TM; Peixe, L. 2011. Non-susceptibility to tigecycline in enterococci from hospitalised patients, food products and community sources. INTERNATIONAL JOURNAL OF ANTIMICROBIAL AGENTS, 38(2), DOI: 10.1016/j.ijantimicag.2011.04.014
  • Freitas, AR; Tedim, AP; Novais, C; Ruiz-Garbajosa, P; Werner, G; Laverde-Gomez, JA; Cantón, R; Peixe, L; Baquero, F; Coque, TM. 2010. Global spread of the hylEfm colonization-virulence gene in megaplasmids of the Enterococcus faecium CC17 polyclonal subcluster. ANTIMICROBIAL AGENTS AND CHEMOTHERAPY, 54(6), DOI: 10.1128/AAC.00134-10

Main research interests

  • Bacteriology and Antibiotic Resistance; Clinical Microbiology; Diagnostics and Infectious Diseases; Surveillance; Typing; Public Health; Food Safety
  • Omics high-throughput methods including genomics, proteomics and cellular macromolecules analysis
  • Epidemiology, evolution and ecology of Enterococcus from different hosts (humans, animals, environment)
  • Genetic basis for transmission of antibiotic resistance; typing of emergent antibiotic resistance mechanisms


  • PhD in Microbiology, Faculty of Pharmacy, University of Porto (2011)
  • Graduation in Pharmaceutical Sciences, Faculty of Pharmacy, University of Porto (2004)