Sergio Guajardo-Leiva

Scientific Collaborator


Viruses are ubiquitous, and viral infections may well affect all bacteria in all environments on Earth at some point in time. If we consider the well-documented information on marine habitats, viruses lyse approximately one-third of the ocean microorganisms per day, liberating carbon and nutrients globally. However, our current knowledge of viral diversity in other environments and their effects on bacterial populations is rudimentary at best. With this aim, I study viral genomics and metagenomics to understand the interaction of viruses with biotic and abiotic factors in different environments. Specifically, I am studying viral communities' role in the biogeochemical cycles of plants' rhizosphere and their interaction with rhizospheric microorganisms and soil’s physicochemical factors. I also study viral diversity and viral dark matter in urban environments such as sewage treatment plants and the urban aerobiome. Finally, I am interested in deciphering aquaculture’s impact on the fjords' viral communities in Chilean Patagonia.

Sergio currently holds a postdoctoral position at Castro Lab, from Universidad Andrés Bello, Chile. And is member of Polarix.


  • Viral ecogenomics
  • Rhizosphere and soil viromics.
  • Urban environmental viromics
  • Antarctic and sub- Antarctic marine viromics.
  • Hot springs viromics.


PhD. in Biological Sciences, 2019

Pontificia Universidad Católica de Chile, Chile

MSc. in Biological Sciences, 2014

Pontificia Universidad Católica de Chile, Chile

BSc in Biochemistry, 2008

Universidad de Santiago de Chile, Chile

      Castro Lab   Polarix

Sergio Guajardo-Leiva
Sergio Guajardo-Leiva
Scientific Collaborator