Summary:
US researchers have found that people who have had mild illness due to Covid-19 go on to develop antibody-producing immune cells that can last for a lifetime and give them protection against the virus. Researchers at Washington University in St.
Louis US found that during a viral infection antibody-producing immune cells rapidly multiply and circulate in the blood driving antibody levels sky-high. Once the infection is resolved most such cells die off and blood antibody levels drop. For comparison the scientists also obtained bone marrow from 11 people who had never had Covid-19. Of the bone marrow samples 15 contained antibody-producing cells specifically targeting the virus that causes Covid-19..