Table 2.

Classification results of contents of counterrumors.

Sentiment polarities and categories		Number of counterrumors (N=18,593), n	Example of classified rumors
Negative
	Negative content indicating negative secondary influences or effects	15,078	Life insurance will become void if people are vaccinated with the COVID-19 vaccine.
	Negative content indicating only “ineffectiveness”	1171	COVID-19 vaccine is not effective against mutant strains.
Neutral
	Neutral content indicating some secondary influences or effects	102	COVID-19 vaccine makes hair thicker. COVID-19 vaccine causes eyelids to project the latest animated images.
Positive
	Positive content indicating positive secondary influences or effects	491	The COVID-19 vaccine can help you get back to your daily routine. As long as the COVID-19 vaccine is given, no one will get seriously ill.
	Positive content indicating simply “effectiveness”	496	COVID-19 vaccine will be effective for one year after vaccination. Apparently, an effective vaccine against COVID-19 is not BCGa but the pneumococcal vaccine.
No evaluation
	No mention of influences or effects	1255	Vaccination for COVID-19 has not progressed. Those who participated in the election ballot were given is given priority for the COVID-19 vaccination.

^aBCG: Bacille Calmette-Guerin.