Malaria therapy with chinine and doxycycline was initiated accordingly and the patient recovered rapidly, despite a markedly prolonged clearance of IE from the blood circulation (14 days).
Importantly, the same pattern was also detected in the maternal circulation several days prior to birth.
Whether it is possible to perform continuous extracorporal circulation for days or weeks, even with biocompatible membranes, without affecting the immune system has not been determined.
In recent years, miRNAs have been detected in plasma, where they are associated with proteins and extracellular vesicles and have been found to be remarkably stable, remaining in the circulation for days [ 12].
It was previously shown in our laboratory that antigen-specific B cells are detected in the circulation between days 5 and 7 after vaccination and thereafter migrate to peripheral lymphoid organs [ 13].
These cellular fragments have a short lifetime in the circulation (5 7 days) and, because their mitochondria cannot be replaced, they have frequently been used as a bioenergetic sensor in human subjects [ 14].
Their ability to align with blood flow and avoid immune system clearance enables them to persist in circulation for days, which is up to 10 times longer than their spherical counterparts.
As shown in Figure 1b, AMD3100 was able to mobilize a similarly large number of cells into the circulation at days 1 and 10, indicating a sustained mobilizing effect of this drug.
In this context, proper regulation of antigen-specific plasmablast generation can be seen after secondary tetanus vaccination, when these cells appear in the circulation between days 6 to 8, but their appearance is downregulated as the immune response wanes [ 26].
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