Sentences with phrase «lower vaccine effectiveness»
A 2014 study used epidemiological data to show egg - based mutations are associated with low vaccine effectiveness in human populations.
https://www.scientificamerican.com/ Not exact matches
However, even in previous years when the vaccine has been well - matched to circulating influenza strains, effectiveness has been low (40 to 60 percent).
However, when the vaccines» effectiveness was examined in different age groups, they were shown to be less effective in adults over 18 years than in children, and effectiveness was lowest in adults over 50 years of age.
«That there was differential protection in this context both underlines the potential importance of even low - virulence or less transmissible strains to older populations and the fact that vaccines may afford relevant effectiveness among frail older persons even when A / H1N1 predominates,» the authors wrote.
Vaccinating older individuals is problematic, as the effectiveness of most vaccines decrease with age, with maximal responses often as low as 30 % in the over 70s.5 Nevertheless, vaccination programmes demonstrate the ability to reduce disease burden in the elderly as well as offering a tool to observe immune responses in vivo in humans.
But it's not very reassuring, especially given what we know about vaccination risks and side effects and the very low effectiveness of flu vaccines.
Early indications are showing the effectiveness of this year's flu vaccine may be lower.