We Skipped Flu Season. That's Bad

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Some experts feared we were in for a "twindemic" during the 2020-2021 flu season. That didn't happen, which might mean that there will be more people susceptible to getting sick this year.

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Sources:
https://www.thelancet.com/journals/lanmic/article/PIIS2666-5247(20)30130-0/fulltext
https://www.amjmed.com/article/S0002-9343(21)00316-8/fulltext
https://www.cdc.gov/flu/weekly/index.htm
https://www.cdc.gov/mmwr/volumes/69/wr/mm6937a6.htm
https://www.pnas.org/content/117/48/30547
https://www.frontiersin.org/articles/10.3389/fpubh.2021.672568/
https://pubmed.ncbi.nlm.nih.gov/778995/
https://www.nature.com/articles/nature01542.epdf
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4873262/
https://onlinelibrary.wiley.com/doi/full/10.1002/jmv.26163
https://www.nature.com/articles/s41422-021-00473-1
https://www.nature.com/articles/s12276-021-00603-0
https://www.cdc.gov/flu/about/viruses/change.htm
https://www.nature.com/articles/293067a0
https://www.liebertpub.com/doi/10.1089/vim.2017.0141
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7768426/
https://www.who.int/news/item/06-08-2009-pandemic-influenza-vaccine-manufacturing-process-and-timeline
https://www.cdc.gov/flu/prevent/vaccine-selection.htm
https://www.who.int/influenza/vaccines/virus/recommendations/202102_recommendation.pdf?ua=1
https://www.cdc.gov/flu/weekly/#ivc
https://www.who.int/publications/i/item/recommended-composition-of-influenza-virus-vaccines-for-use-in-the-2021-2022-northern-hemisphere-influenza-season
https://www.wired.com/story/covid-19-meant-a-year-without-the-flu-thats-not-all-good-news/
https://www.nature.com/articles/s41541-020-0159-8

Images:
https://www.storyblocks.com/video/stock/sick-man-on-couch-coughing-rkgyrxl
https://www.istockphoto.com/photo/multiracial-people-standing-in-a-queue-and-waiting-young-people-with-social-gm1252875644-365730748
https://www.istockphoto.com/photo/retro-old-scientific-laboratory-microscope-circa-40s-on-wooden-table-front-concrete-gm1065742978-284995018
https://svs.gsfc.nasa.gov/3609
https://www.storyblocks.com/video/stock/a-small-piglet-in-the-farm-group-of-pigs-waiting-feed-swine-in-the-stall-hdtmqjyczjfaxj0bq
https://www.storyblocks.com/video/stock/little-mangalica-piglets-grazing-on-green-grass-on-livestock-farm-top-view-striped-wild-boar-pigs-eating-green-grass-in-countryside-breeding-domestic-animals-pig-farming-bdf_8ppwpkgj39zf4
https://www.storyblocks.com/video/stock/portrait-of-doctor-and-people-with-face-masks-coronavirus-covid-19-and-vaccination-concept-waiting-rkkqvaauvkh1wvbix