Here's a wild pre-print titled Evidence for a Connection Between COVID-19 and Exposure to Radiofrequency Radiation from Wireless Telecommunications Including Microwaves and Millimeter Waves. It's just a literature review, and the one author, Beverly Rubik, really likes some rather controversial topics, but the concerns raised are more legitimate than controversial. Dr. Rubik has a Ph. D. in Biophysics from UCa. The other author, Robert R Brown, received his MD from U of Miami. The preview does not render properly in my browser. Clicking "Download preprint" resolves this.