As a cognitive therapist, I have seen an increasing number of patients who are suffering from what has been termed “long-COVID” symptoms. Based on my own (completely unscientific) analysis, there is not a single link that would determine why they all suffer from extended symptoms. They are varying ages, both male and female, have differing occupations and educational levels, etc. Some have significant prior medical issues, and some were healthy with no complaints. So, I turned to the research to see if the people who actually get paid to study this stuff came up with anything better.