Filtering by: Year 2012 Remove constraint Year: 2012 Keyword Antibodies Remove constraint Keyword: Antibodies Keyword Clinical severity Remove constraint Keyword: Clinical severity Keyword Epidemiology Remove constraint Keyword: Epidemiology Research Field Biology, Virology Remove constraint Research Field: Biology, Virology Research Field Health Sciences, Epidemiology Remove constraint Research Field: Health Sciences, Epidemiology Research Field Health Sciences, Immunology Remove constraint Research Field: Health Sciences, Immunology