CD4 and COVID-19: z = -3·953 + 0·007*Xage – 1·290*Xvaccination + 0·275*XCD4+ + 0·155*Xgender, where: p is the probability of contracting COVID19 during the analyzed period (%), Xage is the age (full years), Xvaccination is the–vaccination status (0, not vaccinated;1, vaccinated), XCD4+ is the CD4+ T-cell count (0, < 350; 1, ≥ 350), Xgender is sex (0, Male; 1, Female).