First-line immune defences against COVID-19 are short-lived and may explain reinfection. A new study finds that antibodies produced in the nose decline nine months after COVID-19 infection, while antibodies found in the blood last at least a year. Antibodies in the nasal fluid (known as immunoglobulin A, or IgA) provide first-line defence against COVID-19 by […]
First-line defences short-lived
