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Man looks at syringe as medical professional administers jab [Courtesy]
Months after recovery from mild Covid-19, when antibody levels in the blood have declined, immune cells in bone marrow remain ready to pump out new antibodies against the coronavirus, researchers reported on Monday in Nature.
Upon infection, short-lived immune cells are generated quickly to secrete an early wave of protective antibodies. As the immune cells die out, antibody levels decline.
But a pool of these immune cells, called long-lived plasma cells, is held in reserve after infection. Most of them migrate to the bone marrow, explained coauthor Ali Ellebedy of Washington University School of Medicine in St. Louis.
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Swiftness is essential when treating lung cancer, the second most common type of cancer in the U.S. and the country s leading cause of cancer deaths. For patients with early-stage non-small cell lung cancer, surgical removal of a tumor-infested lung or of a smaller lung section may be the only treatment needed.
However, some patients postpone surgery while seeking second opinions, because of economic or social factors, or for personal reasons such as waiting until after a child s wedding or a planned vacation. Worries about contracting COVID-19 in a clinical setting also have led to delays.
But a new study by researchers at Washington University School of Medicine in St. Louis found that delaying lung cancer surgery for more than 12 weeks from the date of diagnosis with a CT scan is associated with a higher risk of recurrence and death.
Two new studies indicate that the COVID-19 vaccine could give recipients immunity to the virus for at least a year, and potentially longer, raising more questions about whether certain individuals will require booster shots.