Severe COVID linked to more self-attacking antibodies, study saysHospitalized COVID-19 patients were more likely to have autoantibodies, or self-attacking antibodies, than those without COVID-19, according to a study today in Nature Communications.The researchers looked at March and April 2020 blood samples from 147 COVID-19 patients at Stanford-affiliated hospitals, as well as 48 patients from Kaiser Permanente in California, although most of the study's assessments didn't involve the whole cohort.By using three protein arrays to look at immunoglobulin G (IgG) autoantibodies, the researchers found that about 50% of patients had autoantibodies, compared with less than 15% of samples from healthy controls collected pre-pandemic from donors.