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Emerging and re-emerging zoonoses constitute major threats to human health and cause considerable socioeconomic problems globally. More than 60% of human emerging infectious diseases are zoonotic and most (72%) originate in wildlife.1 Zoonotic microbes, with the capacity for human-to-human transmission, have the greatest pandemic potential.2 The 1918 H1N1 influenza pandemic was the most severe in modern history to date and caused the deaths of tens of millions of people worldwide.3 Since then, three other influenza pandemics have emerged: in 1957 (H2N2 or Asian flu), in 1968 (H3N2 or Hong Kong flu), and in 2009 (H1N1 or swine flu).
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Naguib et al. (2020) studied this question.
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