It also matters what their pre-existing status was before they came down with the flu. The article throws around these percentages and groups, but doesn't comme

It also matters what their pre-existing status was before they came down with the flu. The article throws around these percentages and groups, but doesn't comment at all on the relations between the groups - and it could very well be non-trivial. Better info from the following: https://www.cdc.gov/media/releases/2017/p0403-flu-vaccine.html https://www.cdc.gov/media/releases/2017/p0403-flu-vaccine.ht... http://pediatrics.aappublications.org/content/early/2017/03/30/peds.2016-4244 http://pediatrics.aappublications.org/content/early/2017/03/...