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Highlights A predicting model for the long-term epidemic trend of COVID-19 by using LSTM with rolling update mechanism is proposed. The 150-days ahead epidemic trend of COVID-19 in Russia, Peru and Iran are estimated by our proposed model. The results provide that the epidemic of Peru will end in early December. The number of daily cases in Russia and Iran is expected to fall below 2000 and 1000 by mid-November and early December. By introducing diffusion index, the effectiveness of preventive measures taken by the government are analyzed.

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Highlights Discover the new characteristics of the “double peaks” of public opinion. Popular topics have the characteristic of slowly declining over time. There is no inevitable temporal and spatial consistency between topics of high concern and topics of low emotion.

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