The bone marrow samples were taken between seven and eight months after initial COVID infection. Five of the 18 participants then gave second bone marrow samples four months later. The team compared those samples with bone marrow taken from 11 people who had never been diagnosed with COVID-19. Researchers also found antibody-producing cells specifically targeting SARS-CoV-2, the virus that causes COVID-19, in 15 of the bone marrow samples. CLICK HERE FOR COMPLETE CORONAVIRUS COVERAGEThe researchers said it’s not clear if those who have more severe COVID-19 infection would have the same long-lasting protection, as too much inflammation could lead to "defective" immune responses.

Source: Fox News May 26, 2021 15:33 UTC