This journal suppl. entitled: 19th Medical Research Conference; Department of Medicine, The University of Hong Kong, Queen Mary Hospital, Hong KongBACKGROUND: Influenza infection is common among institutionalised older adults. Many non-randomised observational studies on influenza vaccination suggested that it could reduce influenza-related hospitalizations and mortality in institutionalised older adults. Criticism regarding the effectiveness of influenza vaccine estimated by non-randomised observational studies includes the frailty selection bias and use of non-specific outcome like all-cause mortality. A systematic review of studies of influenza vaccination in institutionalized older adults to ...postprin
