You  will find here studies on the effectiveness of individual herbs and/or formulas for Covid 19

Research TCM Covid 19_1

Traditional Chinese Medicine in the Treatment of Patients Infected with 2019-New Coronavirus (SARS-CoV-2): A Review and Perspective.
This is the most detailed research on the effect of different formulas and single herbs on Covid-19.

Research TCM Covid 19_2
Review article: Prevention and treatment of viral respiratory infections with traditional Chinese herbs.

Antiviral effect of several Chinese herbs used for Covid 19

There is a Pharmacological research of single herbs with an antiviral effect as
– Huang Qi (Radix Astragali)
– Jin Yin Hua (Flos Lonicerae Japonicae)
– Ban Lan Gen (Radix Isatidis)

– Yu Xing Cao (Herba Houttuyniae)
– Wu Bei Zi (Galla Chinensis)
– Xiang Chun Ye (Folium Toonae Sinensis)

Elsevier Study
Pharmacological Research: Traditional Chinese Medicine for COVID-19 Treatment; Science direct.

Effect of Chai-Ling decoction in Coronavirus disease
The study applied network pharmacology analysis and molecular docking method to study the potential mechanisms of Chai-Ling decoction (CLD), an empirical formula derived from the classic ancient prescription Xiao-Chai-Hu (XCH) decoction and Wu-Ling-San (WLS), on coronavirus disease 2019 (COVID-19).

Lianhuaqingwen found effective in anti-coronavirus vitro test
Lianhuaqingwen, a common traditional Chinese medicine (TCM), has been found effective against the novel coronavirus in vitro test, according to a research conducted by a team led by renowned Chinese respiratory specialist Zhong Nanshan.

The prevention studies were made with patients and health care professionals

Prevention study against COVID-19

Can Chinese Medicine Be Used for Prevention of Corona Virus Disease 2019 (COVID-19)? A Review of Historical Classics, Research Evidence and Current Prevention Programs.

You will find here studies on the effectiveness of individual herbs and/or formulas for SARS in the years 2002/2003

SARS Hongkong Study
The Use of an Herbal Formula by Hospital Care Workers During the Severe Acute Respiratory Syndrome Epidemic in Hong Kong to Prevent Severe Acute Respiratory Syndrome Transmission, Relieve Influenza-Related Symptoms, and Improve Quality of Life: A Prospective Cohort Study.

Prevention and treatment of viral respiratory infections including SARS
This review focuses on current knowledge of traditional Chinese herbs on prevention and treatment of viral respiratory infections, especially caused by Severe Acute Respiratory Syndromes (SARS) virus, respiratory syncytial virus (RSV) and influenza viruses.

Anticomplementary principles of a Chinese multiherb remedy for the treatment and prevention of SARS

To elucidate the anticomplementary principles of a Chinese multiherb remedy used for the treatment and prevention of SARS, which contains five ingredients of Herba Houttuyniae, Flos Chrysanthemi Indici, Herba Artemisiae Scopariae, Herba Eupatorii and Fructus Tsaoko.

Identification of natural compounds with antiviral activities against SARS-associated coronavirus

More than 200 Chinese medicinal herb extracts were screened for antiviral activities against Severe Acute Respiratory Syndrome-associated coronavirus (SARS-CoV).

Traditional Chinese medicine herbal extracts of Cibotium barometz, Gentiana scabra, Dioscorea batatas, Cassia tora, and Taxillus chinensisinhibit SARS-CoV replication

In this study, more than 200 extracts from Chinese medicinal herbs were evaluated for anti-SARS-CoV activities using a cell-based assay that measured SARS-CoV-induced cytopathogenic effect(CPE) in vitro on Vero E6 cells.

SARS Toona Sinensis
Toona sinensis Roem tender leaf extract inhibits SARS coronavirus replication. Journal of Ethnopharmacology, 120(1), 108-111.

Houttuynia cordata SARS
Immunomodulatory and anti-SARS activities of Houttuynia cordata. Journal of Ethnopharmacology, 118(1), 79-85.

Isatis Indigotica SARS
Anti-SARS coronavirus 3C-like protease effects of Isatis indigotica root and plant-derived phenolic compounds. Antiviral Res, 68(1), 36-42.

Emodin blocks the SARS coronavirus spike protein and angiotensin-converting enzyme 2 interaction.
By screening 312 controlled Chinese medicinal herbs supervised by Committee on Chinese Medicine and Pharmacy at Taiwan, we identified that three widely used Chinese medicinal herbs of the family Polygonaceae inhibited the interaction of SARS-CoV S protein and ACE2. 

You will find here several studies on the antiviral effects of Chinese Herbs as well as on their effect on acute lung injuries and inflammation

Prevention and treatment of viral respiratory infections by traditional Chinese herbs
The review focuses on current knowledge of traditional Chinese herbs on prevention and treatment of viral respiratory infections, especially caused by Severe Acute Respiratory Syndromes (SARS) virus, respiratory syncytial virus (RSV) and influenza viruses.

Antiviral effect on Influenza viruses
Antiviral Activities of several oral Traditional Chinese Medicines against Influenza Viruses. Evid.Based Complement Alternative.Med,2015, 367250.

Antiviral effect on Influenza A
Evaluation of in vitro Antiviral Activity in Methanol Extracts against Influenza Virus Type A from Korean Medicinal Plants. PHYTOTHERAPY RESEARCH, 1059.

Antiviral activity of Isatidis Radix derived glucosinolate isomers and their breakdown products against influenza A in vitro/ovo and mechanism of action

Isatidis Radix, the sun-dried roots of Isatis indigotica Fortune ex Lindl., is one of the most usually used traditional Chinese medicines. For centuries, the herb has been employed in clinical practice for treatment of virus infection and inflammation. 

Chapter Seventeen - The structures and biological functions of polysaccharides from traditional Chinese herbs

Most of traditional Chinese medicine substances come from herbal plants. Polysaccharides are major components of the herb plants and their biosynthesis is partly controlled by the genes but mostly influenced by the availability of the nutrition and determined by the various environmental factors

Antiinflammatory effect of Chinese herbs
Small molecules blocking the entry of severe acute respiratory syndrome coronavirus into host cells. J Virol, 78(20), 11334-11339.

Xiebaisan used for Lung Injury
Protective and anti-inflammatory effect of a traditional Chinese medicine, Xia-Bai-San, by modulating lung local cytokine in a murine model of acute lung injury. Int Immunopharmacol, 6(9), 1506-1514.

Gingyo-san against acute Lung Inflammation
Protective and immunomodulatory effect of Gingyo-san in a murine model of acute lung inflammation.

Chung-San against Lung-Inflammation
Suppression of lung inflammation by the ethanol extract of Chung-Sang and the possible role of Nrf2. BMC Complementary and Alternative Medicine

Mechanisms of Chinese Material Medica against Lung Inflammation
Advances in research into the mechanisms of Chinese Materia Medica against acute lung injury. Biomed Pharmacother, 122, 109706.

Antiviral Proteins in Yuping fengsan
Yu Ping Fengsan, an ancient  Chinese Herbal Decoction, induces Gene Expression of Antiviral Proteins and inhibits Neuramidase Activity. Phythother.REs.29(5),665-661.

Metaanalysis on the effect of Yuping fengsan
Adjuvant Treatment with Yupingfeng Formula for Recurrent Respiratory Tract Infections in Children: A Meta-analysis of Randomized Controlled Trials. Phytother Res, 30(7), 1095-1103.

Antiinflammatory Mechanisms of "Herbs that remove Heat"  
Majority of Chinese Medicine Herb Category “Qing Re Yao” have Multiple Mechanisms of Anti-inflammatory Activity. Scientific Reports, 8(1).