Citations:PBMC


 * 2020, Coronavirus in Africa: Could poverty explain mystery of low death rate?, Andrew Harding, (3 September 2020);
 * The idea is that, by studying the PBMCs, the scientists might find evidence that people had been widely infected by other coronaviruses - those, for instance, responsible for many common colds - and that, as a result, they might enjoy some degree of immunity to Covid-19.