Thai Hospital and Herbal Research Covid 

 In late June 2020, The Nation Thailand reported that phase 1 of the Thai research initiative on Andrographis for COVID-19 had begun at two hospitals in Thailand, six subjects.

In late August 2020, The Nation Thailand reported that the lower dose of andrographis showed benefits in the preliminary trial, especially for coughing. Within three days, both cough volume and overall symptom severity reportedly decreased significantly.

After five days, other symptoms improved, and real-time polymerase chain reaction (PCR) tests were negative for the COVID-19 virus in two patients.

After three weeks, real-time PCR tests were negative in all six subjects, but additional studies were needed to confirm the results.

There are a lot of research studies ongoing around the world, Kan jang or andrographus is a very powerful herb, and helps when ever I have a flu.

You can google thai hospital and covid for a copy of the study.