In Traditional Chinese Medicine Artemisia annua has been used for over 2,000 years to help with occasional digestive complaints. It has been used for millennia in Southeast Asia to treat "fever".
"Many infectious microbial and viral diseases have been shown to respond to A. annua and communities around the world use the plant as a medicinal tea, especially for treating malaria."https://pubmed.ncbi.nlm.nih.gov/33442683/
 
An in vitro study was released in Feb 2021 that showed Artemisia annua hot water extract (Tea) successfully inhibited “SARS-CoV-2 infection, and the active component(s) in the extracts is likely something besides artemisinin or a combination of components that block virus infection at a step downstream of virus entry. Further studies will determine in vivo efficacy to assess whether A. annua might provide a cost-effective therapeutic to treat SARS-CoV-2 infections.”
The study is in pre-print & has not yet been peer reviewed
https://pubmed.ncbi.nlm.nih.gov/33442683/
 
"Artemisia annua and its phytocompounds have a rich history in the research and treatment of malaria, rheumatoid arthritis, systemic lupus erythematosus, and other diseases."
https://pubmed.ncbi.nlm.nih.gov/34479848/