Name Info Provider Link
Flu free resource MedlinePlus Health Information https://medlineplus.gov/flu.html
free resource CDC - Morbidity and Mortality Weekly Report https://www.cdc.gov/mmwr/preview/mmwrhtml/mm6349a2.htm
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/25503917/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/25503917