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PMC:7279430 / 2354-3238
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{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/7279430","sourcedb":"PMC","sourceid":"7279430","source_url":"https://www.ncbi.nlm.nih.gov/pmc/7279430","text":"Essential oils have been screened against several pathogenic viruses (Table 1), including influenza and other respiratory viral infections. Influenza is an infectious respiratory disease caused by one of three types of influenza viruses, type A, type B, or type C [4]. The most significant in terms of human morbidity and mortality is influenza virus type A, which is found in several bird and mammal species [5]. Several different serotypes of influenza type A have caused global flu pandemics [6]: H1N1, which caused the Spanish flu in 1918 (40–50 million deaths worldwide) [7] and the swine flu in 2009 [8]; the Asian flu of 1957–1958 (ca. 1.5 million deaths worldwide) was caused by influenza A H2N2 [8]; serotype H3N2 caused the Hong Kong flu in 1968 [9]; and H5N1, which caused the bird flu in 2004 [10]. 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