Table 6.

Topics grouped by thematic cluster, including the percentage of articles by topic and cluster.

Thematic cluster, topic number, and title				Articles (N=28,904), n		Topic dominance (%)		Cluster dominance (%)
Clinical aspects								29.17
	(2)	Clinical care practices for patients during the COVID-19 pandemic	5118		17.71
	(3)	Clinical characteristics and risk factors of COVID-19	3313		11.46
Epidemiology								28.91
	(1)	Public health response	5393		18.66
	(4)	Epidemic models for COVID-19 spread	2964		10.25
Therapeutics								21.03
	(5)	Therapies and vaccines for COVID-19	1845		6.38
	(6)	Host immune response	1837		6.36
	(11)	Virus genomics	816		2.82
	(12)	Protein structures of 2019-nCoV	706		2.44
	(13)	Host cell entry	584		2.02
Diagnostics								9.98
	(7)	Diagnosis of COVID-19 using PCR	1602		5.54
	(9)	Diagnosis of COVID-19 based on chest imaging	874		3.02
	(15)	Detection of 2019-nCoV antibodies	411		1.42
Related conditions								7.70
	(8)	Mental health and disorders during the COVID-19 pandemic	915		3.17
	(14)	Patients with cancer during the COVID-19 pandemic	441		1.53
	(17)	Diabetes mellitus and COVID-19	336		1.16
	(18)	Pregnancy and childbirth during the COVID-19 pandemic	312		1.08
	(19)	Organ transplantation during the COVID-19 pandemic	219		0.76
Prevention								4.21
	(10)	Social distancing measures	868		3
	(16)	Personal protective equipment	350		1.21