Janjua, S.I. et al. 2023. Frequency of SARS-CoV-2 Antibodies in PCR-Positive COVID-19 Patients and High-Risk Exposed Subjects at Multan. Pakistan Armed Forces Medical Journal. 73, 4 (Aug. 2023), 1095–1099. DOI:https://doi.org/10.51253/pafmj.v73i4.8820.