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. 2019 Feb 18;219(10):1596–1604. doi: 10.1093/infdis/jiy719

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© The Author(s) 2019. Published by Oxford University Press for the Infectious Diseases Society of America. All rights reserved. For permissions, e-mail: journals.permissions@oup.com.

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Figure 1. — Dyspnea in pigs infected by A(H1N1)pdm09 viruses. Dyspnea score (arithmetic mean), after infection of approximately 11- to 16-week-old pigs by different A(H1N1)pdm09 viruses isolated from 2009 to 2015. Statistical probability (Mann–Whitney U test): *P ≤ .05, **P ≤ .01, ***P ≤ .001. There were no significant differences between viruses SC14 and KI15; therefore, all statistical calculations were done with the viruses isolated in 2009–2010 (HA09, JE09, JE10) in comparison to KI15. Significant differences were also found within the group of virulent viruses: HA09 > JE09 (P < .001 at days 1–3 and P < .01 at days 5–9) > JE10 (P < .019 at day 5). Number of pigs: HA09, 17; JE09, 15; JE10, 15; SC14, 13; KI15, 19. Animals that died from influenza (group HA09) were provided with the highest score (4) in the calculations. Abbreviations: a, afternoon; m, morning; n.s., not significant.