[1] Univ Lausanne, Ctr Res Intracellular Bacteria, Inst Microbiol, Fac Biol & Med, Lausanne, Switzerland
[2] Cent Inst Valais, Dept Infect Dis, Sion, Switzerland
[3] Univ London Imperial Coll Sci Technol & Med, St Marys Hosp, Dept Obstet & Gynaecol, London, England