Acknowledgments
We would like to thank the staff of the Center of Excellence in Clinical Virology, Faculty of Medicine, Chulalongkorn University for their excellent technical and administrative assistance.
Author Contributions
Conceived and designed the experiments: YP PS. Performed the experiments: PS NP PV. Analyzed the data: PS. Contributed reagents/materials/analysis tools: PS NP PV NW SO RW TT KP AT. Wrote the paper: PS SV YP.