XPost: misc.news.internet.discuss   
   From: here@is.invalid   
      
   A blood test for long Covid is possible, new research suggests   
      
   More than three years into the pandemic, the millions of people who   
   have suffered from long Covid finally have scientific proof that their   
   condition is real.   
      
   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 findings, published Monday in the journal Nature, also offer clues   
   into what could be causing the elusive condition that has perplexed   
   doctors worldwide and left millions with ongoing fatigue, trouble with   
   memory and other debilitating symptoms.   
   ...   
   ...   
   The activity of immune system cells called T cells and B cells --   
   which help fight off germs -- was "irregular" in long Covid patients,   
   Putrino said. One of the strongest findings, he said, was that long   
   Covid patients tended to have significantly lower levels of a hormone   
   called cortisol.   
      
   A major function of the hormone is to make people feel alert and   
   awake. Low cortisol could help explain why many people with long Covid   
   experience profound fatigue, he said.   
      
   https://www.nbcnews.com/health/health-news/long-covid-difference   
   -blood-test-study-finds-rcna116871   
      
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