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Pandemic Preparedness Resources

Preparedness for tracking resistant and virulent bacterial and fungal pathogens (TRACK-PATH)


PI(s)/Head responsible for the resource:

Christian Giske

Host organisation(s):

Clinical microbiology, Karolinska University Laboratory and Department of Laboratory medicine, Karolinska Institutet

Resource description:

The project consists of three parts:

  1. Characterization of microbial strains (bacteria and fungi) with resistance to recently introduced antimicrobials.
  2. Characterization of virulent pathogens causing unexpectedly severe infections.
  3. Exploring methods for studying host-pathogen interaction. During the first months of the project a bioinformatician has been recruited to work on transcriptomics and on establishing pipelines for characterization of virulent pathogens.

We have selected >40 isogenic mutants of Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, and Acinetobacter baumannii with resistance to at least one of the two novel antimicrobials cefiderocol and aztreonam-avibactam. The strains are ready to be analyzed regarding transcriptomics, as well as for some chromosomal mechanisms of resistance that are not presently mapped in publicly available pipelines. The goal is to be able to study outer membrane porins, penicillin-binding proteins, multidrug efflux pumps, as well as iron transporters of importance for cefiderocol uptake. The work with the pipelines is already advanced.

We have also explored methods for characterizing antifungal resistance in Candida spp, in collaboration with the European reference laboratory at Statens Serum Institut, Copenhagen, Denmark. Finally, we have started collecting lower respiratory samples for assessment of host transcriptomics. This is done in close collaboration with the Niklas Björkström laboratory. The goal is to provide ex vivo information of the ongoing host response and how it differs compared to wildtype variants whilst the latter will yield more reductionistic insights into host responses.

Contact information:

Christian Giske
Clinical microbiology, Karolinska University Laboratory and Department of Laboratory medicine, Karolinska Institutet
Email: Christian.giske@ki.se