Posted 15th September 2018
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Flu virus is mutating into other strains and the vaccine has not been sufficiently attenuated, with the result that there was a 3-fold increase in flu.
See study: PLoS One. 2018 Apr 17;13(4):e0195611. doi: 10.1371/journal.pone.0195611. eCollection 2018. https://www.ncbi.nlm.nih.gov/pubmed/29664931