1 Department of Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan.
2 Christopher S. Bond Life Sciences Center, Department of Molecular Microbiology and Immunology, and Department of Veterinary Pathobiology, University of Missouri, Columbia, MO, USA.
3 Hokkaido University, Institute for Vaccine Research and Development (HU-IVReD), Sapporo, Japan.
4 Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, Bryan, TX, USA.