There’s some good news in the battle against long Covid

There is also some indication we may be getting closer to more precisely defining and treating long Covid. Many studies around the world have been set up to recruit groups with long Covid to compare them with “rapid recovery” cases – people who recovered quickly and fully from Covid – to try to find differences in levels of antibodies, hormones, immune cells or other things that can be measured with a blood test. These so-called “defining biomarkers” can be gamechangers. They can help health services define and refer cases, provide more extensive evidence for employers and tribunals, and also point towards identification of therapies and treatments. One of the first such studies was reported this month in a preprint from Akiko Iwasaki, David Putrino and colleagues at Yale. They report a clear biomarker delineating differences in the long Covid group, with signals including low serum cortisol (a hormone involved in control of the stress response) and evidence of reactivation of latent Epstein-Barr virus.