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With coronavirus lost brain matter, particularly in areas of the brain involved with smell and taste. the results are early and they still need to be peer reviewed. the researchers didn't correlate to function and unable to tell if the changes were symptom of disease or mark of infection. >> the other thing that we don't know that i think is essential is to understand how much the s vir virus itself enters into the brain and which cells. >> reporter: while 70% of people recover by nine months, 30% of patients like smith may not. for her, it's been a long road but there is one thing she wants m...

It seems anyone is at risk of long covid. particularly those unvaccinated as variants like delta become more prominent. >> a lot of long covid patients will tell you a lot of our symptoms and trouble don't show up on tests. >> reporter: it's an additional complication on top of an already complicated relationship of health care for people of color that may be marginalized and stereo typed. >> there is nothing worse than being told when vision is lost in your left eye, it's a dry eye when meeting the right doctor, i found out it was actually a dense cataract that formed due to the inflammation ...

Is most at risk? dr. sanjay gupta is "outfront". >> reporter: this time last year, shameer smith would have thought this was impossible. the 39-year-old middle schoolteacher could barely move after getting covid-19 in march of 2020. >> i was mostly bed bound. >> reporter: now more than a year later, she can walk for up to 15 minutes but continues to experience symptoms. >> my first symptoms were a sore throat. i was dizzy and i had a slight shortness of breath and quickly over the course of time that grew into vision loss, memory loss, episodes of psychosis. >> reporter: experts think a tenth ...