The new coronavirus SARS-CoV-2 is responsible for the COVID-19 epidemic. SARS-CoV-2 accesses host cells by ACE2, which is abundantly expressed in the heart, kidneys, and lungs and shed into the plasma. Many SARS-CoV-2 patients' neutralizing antibody titers and memory B cell responses may be transient, exposing them to re-infection. Notably, neutralizing antibody titers and the number of virus-specific T cells had a substantial relationship. Our findings lay the groundwork for additional

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... into protective immunity against SARS-CoV-2 and the etiology of COVID-19, particularly in severe instances. The most important characteristic of our findings a positive correlation between all parameters (cellular and humoral) and COVID-19 patients compared with healthy group excepting neutrophil cells where no significant difference was observed between the two groups. Lymphopenia and elevated levels of specific cytokines, such as IL-6, IL-10, and TNF-α, have been linked to illness severity in general. T cells are thought to play a key role in the first immune response. In extreme situations, a significant drop in T cell counts is virtually always detected.