ESR1 and COVID-19: Both markers used for inflammation were well correlated with each other (Figure 1), so we used—for the diagnosis of long COVID-19—patients who showed increased ESR or hsCRP values at the 4-month visit and the 12-month visit, respectively, along with symptoms like fatigue, shortness of breath, cognitive dysfunction (often referred to as “brain fog”), muscle pain, joint pain, chest pain, cough, difficulty sleeping, headache, heart palpitations, loss of taste or smell, depression or anxiety, and fever.