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Viral Infections free resource MedlinePlus Health Information https://medlineplus.gov/viralinfections.html
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/2982972/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/2982972
subscription/membership/fee required Silverchair Information Systems https://academic.oup.com/jid/article-lookup/doi/10.1093/infdis/151.4.731