Decoded: How different immune cells respond to Covid infection By IANS | 2 Views Decoded: How different immune cells respond to Covid infection. Image Source: IANS News London, April 21 : Researchers have identified differences in the immune response to Covid-19, between people with no symptoms, compared to those suffering a more serious reaction to the virus. The differences could help explain serious lung inflammation and blood clotting symptoms, and could be used to identify potential targets for developing therapies. The study, published in the journal Nature Medicine, found increased levels of B cells that produce antibodies that are found in mucus passages, such as the nose, in people with no symptoms.