Computer Science and Artificial Intelligence Laboratory, Massachusetts Institute of Technology, Cambridge, MA, USA.|Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institute of Health, Bethesda, MD, USA.|Qatar Computing Research Institute, Hamad Bin Khalifa University, Doha, Qatar.|Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institute of Health, Bethesda, MD, USA.|Qatar Computing Research Institute, Hamad Bin Khalifa University, Doha, Qatar.|Qatar Computing Research Institute, Hamad Bin Khalifa University, Doha, Qatar.