Here's what cdc.gov has to say:  https://www.cdc.gov/coronavirus/2019-ncov/faq.html   about the source of the Corona Covid-19  virus.

Here's a link to NIH:  https://www.nih.gov/health-information/coronavirus

Check out the World Health Organization pages also.

Here's a link to Mayo Clinic:  https://newsnetwork.mayoclinic.org/category/covid-19/

Stay well.