Ahmed, A. et al. 2022. COMPARISON OF FOURTH WAVE VARIANT OF SARS-COV-2 AND ANCESTRAL WAVES, AN EXPERIENCE FROM A TERTIARY CARE HOSPITAL, KARACHI. Pakistan Journal of Pathology. 33, 4 (Dec. 2022), 129–133. DOI:https://doi.org/10.55629/pakjpathol.v33i4.735.