In October 2012, a hepatitis A (HA) outbreak with 83 laboratory-confirmed cases occurred in Lower Saxony. Primary outbreak cases were identified as people with laboratory-confirmed HA and symptom onset between 8 October and 12 November 2012, residing in or visiting the affected districts. Fifty (50) primary cases and 52 controls matched for age and sex were enrolled. Eighty-two percent (82%) of cases and 60% of controls consumed products from a particular bakery. What is this study design?

Calculate the measure of association and interpret