‘One,’ he says, is that study topics did not understand how they have to be vaccinated often. Some seniors believed that, like vaccines against common childhood illnesses, the flu vaccine supplied lifelong safety against the flu. Many did not know they would have to be re-vaccinated every full year. ‘The participants knew there will vary strains of influenza,’ he says, ‘but they didn’t understand they needed to be vaccinated against each strain as it turned up. ‘Some also thought – – as do many people of the public – – that the vaccines trigger the flu. If indeed they became unwell with a virus of 1 kind or additional around the time that they had a flu shot,’ he says, ‘they drew the erroneous conclusion that the shot produced them ill.Hosseinipour, M.D., Nagalingeswaran Kumarasamy, M.B., B.S., James G. Hakim, M.D., Johnstone Kumwenda, F.R.C.P., Beatriz Grinsztejn, M.D., Jose H.S. Pilotto, M.D., Sheela V. Godbole, M.D., Sanjay Mehendale, M.D., Suwat Chariyalertsak, M.D., Breno R. Santos, M.D., Kenneth H. Mayer, M.D., Irving F. Hoffman, P.A., Susan H. Eshleman, M.D., Estelle Piwowar-Manning, M.T., Lei Wang, Ph.D., Joseph Makhema, F.R.C.P., Lisa A. Mills, M.D., Guy de Bruyn, M.B., B.Ch., Ian Sanne, M.B., B.Ch., Joseph Eron, M.D., Joel Gallant, M.D., Diane Havlir, M.D., Susan Swindells, M.B., B.S., Heather Ribaudo, Ph.D., Vanessa Elharrar, M.D., David Burns, M.D., Taha E. Taha, M.B., B.S., Karin Nielsen-Saines, M.D., David Celentano, Sc.D., Max Essex, D.V.M., and Thomas R.