Fig. 3

The SIR and SEIR models were used to analyze the epidemic situation in Wuhan. a The fitted curve (blue) for Wuhan, where red points represent the actual number of cases; b SEIR model analysis for Wuhan; and c Hospital isolation included in the model analysis for Wuhan. Hospital isolation model with different isolation ratios showing that the peak of the outbreak occurred on day 450. d The fitted curve (blue) for South Korea; red points represent the actual number of cases. e SEIR model analysis for South Korea. f Hospital isolation model with different isolation ratios included in the model analysis for South Korea. The peak of the outbreak occurred on day 450. g The fitted curve (blue) for Italy; red points represent the actual number of cases. h SEIR model analysis for Italy. i Hospital isolation model with different isolation ratios included in the model analysis for Italy, and the peak of the outbreak occurred on day 405