Name	Info	Provider	Link
Flu	free resource	MedlinePlus Health Information	https://medlineplus.gov/flu.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/25878298/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/25878298
	free resource	scite Smart Citations	https://scite.ai/reports/25878298
	subscription/membership/fee required	Silverchair Information Systems	https://academic.oup.com/cid/article-lookup/doi/10.1093/cid/ciu1175