[1] Univ Massachusetts, Sch Med, Dept Microbiol & Physiol Syst, Worcester, MA 01655 USA
[2] Univ Minho, Sch Hlth Sci, Life & Hlth Sci Res Inst ICVS, P-4710057 Braga, Portugal
[3] ICVS 3Bs PT Govt Associate Lab, P-4710057 Braga, Portugal
[4] Harvard Univ, Sch Med, Div Med Sci, Program Immunol, Boston, MA 02115 USA
[5] Brigham & Womens Hosp, Dept Med, Div Infect Dis, Boston, MA 02115 USA