1 Department of Infectious Diseases, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg 41346, Sweden.
2 Department of Infectious Diseases, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg 41346, Sweden. Electronic address: magnus.lindh@microbio.gu.se.
3 Department of Mathematical Sciences, Chalmers University of Technology, Gothenburg, Sweden.