In January 2020, the World Health Organization (WHO) classified COVID-19 to be a Public Health Emergency of International Concern and declared it a pandemic on March 11, 2020 [1]. Over one hundred and eighty-five million people have been infected by SARS-CoV-2 and roughly four million have died worldwide so far

Acanthamoeba was first described by Castellani and represents single-cell eukaryotes existing as either cellular trophozoites (25–40 ?m) or under adverse conditions (desiccation, lack of food, and extreme pH or temperature fluctuations), as dormant cysts (13–20 ?m). The cysts are known to be resistant to antibiotics, the effects of chlorine, and very low temperatures, and have been shown to maintain viability for over 20 years.

Coronavirus disease 19 (COVID-19) mRNA vaccines have gained international acceptance and have been proven to be safe and effective [1,2]. In a study of 3,950 frontline healthcare workers with no previous laboratory documentation of COVID-19 [3],

Peripheral circulating B-lymphocytes and B-lymphocytes in the bone marrow (BM) show different responses to lymphotoxic or immunosuppressive agents. We explored the existence of a dysregulated distribution of B-lymphocytes between peripheral and BM compartments and the underlying mechanisms. The percentage of CXC chemokine receptor 4⁺ B (CXCR4⁺ B) cells was decreased in the peripheral blood (PB) and increased in the BM of MRL/lpr mice and SLE patients.

CD38 is a transmembrane protein expressed in immune and non-immune cells involved in nicotinamide adenine dinucleotide (NAD⁺) consumption, cyclic Adenosine Diphosphate Ribose (cADPR) generation, and calcium mobilization by its enzymatic activity. It also promotes an activated and pro-inflammatory phenotype in immune cells. Senescence is a cellular state of cell growth arrest accompanied by senescent-associated secretory phenotype (SASP) products.