Immunoglobulins, or antibodies, are produced by white blood cells. They help your body defend against infections and conditions like cancer. Tests measure them and help diagnose these medical ...

Selective IgA deficiency may be an under-recognized risk factor for severe COVID-19, Rohan Ameratunga, Euphemia Leung, See-TarnWoon, Edward Lea, Caroline Allan, Lydia Chan, Richard Steele, Klaus ...