There’s still a lot to learn about COVID-19, the respiratory disease caused by the new coronavirus. One thing experts know for sure is that symptoms can look like those of other conditions, including the flu. Because of this, along with the fact that testing wasn’t widely available at the beginning of the pandemic, some people weren’t tested. Talk to your doctor about taking an antibody test if you had COVID-19 symptoms at some point or if you have long-term symptoms that just won’t go away. These can include fatigue, cough, trouble breathing, headache, and joint pain.