The patients with influenza or latent infection are the main source of its infection, and the infectivity persists for 1-7 days after onset, which is the strongest during the first 2-3 days after onset. Pigs, cattles, horses and other poultries may also spread influenza.
CITATION STYLE
Wang, J. (2016). Epidemiology of influenza. In Radiology of Influenza: A Practical Approach (p. 7). Springer Netherlands. https://doi.org/10.1007/978-94-024-0908-6_3
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