Profile of participants included in primary influenza VE analysis, 2012–13, Canada.

TIV = trivalent influenza vaccine; VE = vaccine effectiveness.a. Including any one or more of heart, pulmonary, renal, metabolic, blood, cancer, or conditions that compromise immunity or the management of respiratory secretions, or morbid obesity [20].b. For the 2012–13 season, of 319 participants reporting vaccine receipt ≥2 weeks before symptom onset, 298 reported this was given through injection, 5 through nasal spray (all children except one) with route of administration unspecified for 16.c. Children d. Children e. In Canada, AS03-adjuvanted monovalent A(H1N1)pdm09 vaccine comprised >95% of doses distributed [17].f. Children