The invention discloses a use of a mulberry (Morus alba L.) extract, including a method for treating ulcerative colitis, a method for preventing ulcerative colitis, and a method for reduction in Disease Activity Index, DAI. The use is application of a mulberry extract to the preparation of a product for treating and/or preventing ulcerative colitis. The invention experimentally demonstrated that positive drug group, SZ-A-1, SZ-A-2, SZ-A-3, SZ-A-4 and SZ-A-5 (pretreatment) could each significantly inhibit colonic atrophy in UC model mice, and the effects in SZ-A-2, SZ-A-3 and SZ-A-4 groups are comparable to that in positive drug group, with SZ-A-5 (pretreatment) achieving a superior effect to the positive drug. The mulberry extract of the invention, as a component derived from natural plants, has unique advantages of small toxic and side effects, mild and lasting actions etc.

Application of a traditional Chinese medicine composition to preparation of a medicine for treating or preventing coronavirus infection. The traditional Chinese medicine composition includes: 5-30 parts of Herba houttuyniae, 5-30 parts of Flos lonicerae, 5-20 parts of Radix paeoniae rubra, 3-15 parts of Folium artemisiae argyi and 3-15 parts of Herba menthae. The traditional Chinese medicine composition has a good effect of treating or preventing coronavirus-related diseases.