September 25, 2023 Mainstream news - “Scientists have found clear differences in the blood of people with long Covid — a key first step in the development of a test to diagnose the illness.” “The research is among the first to prove that LC is, in fact, a biological illness”- https://www.nbcnews.com/health/health-news/long-covid-differences-blood-test-study-finds-rcna116871