Table 2.

Topics discussed by users with the chatbot identified by the Latent Dirichlet Allocation topic model and their prevalence.

Theme and topic			Examples		Conversation blocks (N=6594), n (%)
Outbreak of COVID-19					1084 (16.4%)
	1. Spread of COVID-19	The virus spread around the world Coronavirus are spreading		821 (12.4%)
	2. Wuhan	When will wuhan virus end? Wuhan virus. do you believe it originated from that		263 (4.0%)
Preventive behaviors					1665 (25.3%)
	3. Masks	We have to wear a face mask I hate wearing a mask all the time		354 (5.4%)
	4. Avoidance	Take care not to get infected when you go out You can't be around the children if you had the corona		324 (4.9%)
	5. Vaccines	I got this covid vaccine When can I get a vaccine		265 (4.0%)
	6. Lockdowns	I don't want to just stay at home..i'm bored In lockdown cause of coronavirus very annoying		361 (5.5%)
	7. Social distancing	People have to practice social distancing No! There's corona virus we need social distancing		361 (5.5%)
Physical and psychological impact of COVID-19					1052 (16.0%)
	8. Fear	Coronavirus is ruining everything I'm not scared of the corona, but of the fear		375 (5.7%)
	9. Deaths	It is a virus that is killing people and economy My country many people died because of the virus		310 (4.7%)
	10. Symptoms	I'm sick with a fever and a sore throat I have a fever		367 (5.6%)
People and life in the pandemic					777 (11.7%)
	11. Wishes	Stay safe ok? stay safe SimSimi, #corona virus Hope you are safe during this pandemic		146 (2.2%)
	12. Small talk	How are you holding up during like pandemic? It's true. I have covid. I love you too		385 (5.8%)
	13. Impact of COVID-19 on individuals	I don't want to put my family on risk My city is shut down and i'm worried for my friend's health		246 (3.7%)
Questions on COVID-19 asked to the chatbot					2016 (30.6%)
	14. Current situation	How bad is this covid issue that's going on right now How is your country dealing with pandemics right now?		338 (5.1%)
	15. Awareness	Do u know the coronavirus? Do you know about the virus?		676 (10.3%)
	16. Quarantine tips	What are u doing during the quarantine of covid 19? How have you dealt with quarantine?		290 (4.4%)
	17. Opinions	What do you think about this pandemic What are your thoughts on the pandemic situation?		384 (5.8%)
	18. Case and death counts	How many casualties are being infected there? How many countries have COVID-19		328 (5.0%)