Table 1.

Monthly latent topics. It lists two rows of topics and 10 words from each of the combined dataset ranging from Dec 1, 2020 to May 15, 2021, and monthly topics. see https://github.com/Cheltone/NLP_Reddit for an interactive topic model.

	Combined data set (December 1, 2020–December 31, 2020)
Topic number	Latent topics
1	vaccine, people, effect, time, many, thing, year, death, month, good
2	vaccine, effect, side, week, hour, day, second, fever, symptom, sore
3	vaccine, people, dose, mask, thing, group, datum, year, immunity, efficacy
4	vaccine, virus, people, immune, system, year, antibody, vaccination, immunity, body
5	vaccine, question, contact, concern, action, people, source, news, moderator, answer
	December 2020
1	vaccine, virus, immune, system, question, cell, protein, infection, symptom, body
2	vaccine, dose, trial, group, first, efficacy, datum, case, day, participant
3	vaccine, people, year, thing, effect, time, virus, long, side, good
	January 2021
1	vaccine, dose, effect, people, side, day, second, week, first, shot
2	vaccine, people, virus, year, time, good, immunity, immune, risk, case
	February 2021
1	vaccine, dose, second, effect, day, side, week, people, first, hour
2	vaccine, people, virus, immune, vaccination, immunity, time, antibody, cell, mask
	March 2021
1	vaccine, people, virus, mask, year, thing, immunity, good, time, immune
2	vaccine, vaccination, dose, death, question, effect, week, day, people, concern
	April 2021
1	vaccine, people, mask, thing, year, effect, time, vaccination, virus, death
2	vaccine, people, virus, vaccination, immune, t, immunity, death, effect, time
	May 2021
1	vaccine, people, effect, side, time, second, shot, week, death, day
2	vaccine, people, mask, virus, vaccination, immunity, risk, year, thing, t