Table 6.

Keywords of the five topics with emotion of disgust.

Topic	Keywords
1	Epidemic, COVID-19, bad, really, people, can't, want to say, prevention and control, nasty
2	Outbreak, prevention and control, nucleic acid, personnel, testing, work, charges, isolation, COVID-19
3	COVID-19, infectious disease, someone, crime, control, epidemic, obstruction, suspected, fever
4	COVID-19, vaccine, detection, U.S., symptoms, infection, virus, human, pneumonia
5	Prevention and control, outbreak, charges, nucleic acid, remediation, personnel, found, several, not, implemented, people