Seasonal influenza vaccine effectiveness in people with asthma: A national test-negative design case-control study

Eleftheria Vasileiou, Aziz Sheikh, Chris C. Butler, Chris Robertson, Kimberley Kavanagh, Tanya Englishby, Nazir I. Lone, Beatrix Von Wissmann, Jim McMenamin, Lewis D. Ritchie, Jürgen Schwarze, Rory Gunson, Colin R. Simpson