title: Reply to Tham et al.
authors.affiliation: Laboratory of Clinical Infectious Diseases.
authors.forename: Yingda L
authors.initials: YL
authors.lastname: Xie
authors.affiliation: Laboratory of Clinical Infectious Diseases.
authors.forename: Ray Y
authors.initials: RY
authors.lastname: Chen
authors.affiliation: Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, NIH, Bethesda.
authors.forename: Irini
authors.initials: I
authors.lastname: Sereti
authors.affiliation: Laboratory of Clinical Infectious Diseases.
authors.forename: Christa S
authors.initials: CS
authors.lastname: Zerbe
authors.affiliation: Laboratory of Clinical Infectious Diseases.
authors.forename: Steven M
authors.initials: SM
authors.lastname: Holland
authors.affiliation: Center for Biologics Evaluation and Research, FDA, Silver Spring, Maryland.
authors.forename: Sarah K
authors.initials: SK
authors.lastname: Browne