Case Counts Death Counts Number of % of students University Outbreak time (Number of (Number of undergrad who received first Location period cases) deaths) students dose vaccine Mar 2013 - Mar New Jersey 5,000 95% 2014 California Nov 2013 4 19,000 51% Rhode Island Jan - Feb 2015 2 3,700 94% Oregon A Jan - May 2015 7 20,000 52% California Jan - Feb 2016 N 5,000 90% New Jersey Mar - Apr 2016 N 35,000 NA Wisconsin Oct 2016 30,000 67% Nov 2016 - Nov Oregon B UT 25,000 98% 2017 Oct 2017 - Feb Massachusetts 3 26,000 34% 2018 Pennsylvania Nov 2017 2 3,600 14% Question What is the risk of meningococcal B disease at university Oregon B? That is, what's the risk of being a case among university Oregon B students in the time period observed