TABLE 1.

Data sets included in the meta‐analysis

					COVID‐19
NCBI Bioproject	PMID	Nation	Number of samples	Healthy	Moderate	Severe	Total
This study	This study	Italy	32	11	6	15	21
PRJNA624223	32442562	China	30	15	10	5	15
PRJNA660883	32909002	North America	31	‐	20	11	31
PRJEB28543	31705027	North America	28	‐	‐	‐	‐
PRJNA689961	34687739	China	136	70	66	‐	66
PRJNA740067	35281785	China	26	13	12	1	13
PRJNA762232	34926314	China	2	1	1	‐	1
PRJNA792726	‐	China	38	‐	24	14	38