1.
Jacobson B, Khan A, Shulman A, et al. Heterologous vaccination of BNT162b2 in Ad26. COV2.S-vaccinated healthcare workers elicits long-term humoral immune response. S Afr Med J. 2022;112(10):828-837. doi:10.7196/SAMJ.2022.v112.i11.16614