1. Mucosal Immunology Section, Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Disease, National Institutes of Health (NIH), Bethesda, MD 20892, USA.
2. Laboratory of Gnotobiology and Immunology, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais 31270-901, Brazil.
3. Microbiology, Immunology and Cancer Biology Program, University of Minnesota, Minneapolis, MN 55455, USA.
4. Department of Immunology, University of Washington, Seattle, WA 98195, USA.
5. Department of Pathology, University of Alabama–Birmingham, Birmingham, AL 35294, USA.
6. Mucosal HIV and Immunobiology Center, University of Alabama–Birmingham, Birmingham, AL 35294, USA.