de Swardt CL, de Villiers M, Van Zyl D. The association between comorbid conditions and CD4+ T-cell counts with in-hospital mortality of patients with moderate to critical COVID-19 disease. S Afr Med J [Internet]. 2025 Nov. 4 [cited 2026 Apr. 19];115(10):e2793. Available from: https://www.samajournals.co.za/index.php/samj/article/view/2793