[1] Univ Bern, Dept Chem & Biochem, Freiestr 3, CH-3012 Bern, Switzerland
[2] Univ Bern, Vetsuisse Fac, Inst Immunol & Virol, Dept Infect Dis & Pathobiol, Langgassstr 122, CH-3012 Bern, Switzerland
[3] Inst Immunol & Virol, Bern, Switzerland
[4] Univ Bern, Grad Sch Cellular & Biomed Sci, Bern, Switzerland