Estimating the prevalence of adverse effects following immunization (AEFI) with Covid-19 vaccination and to determine association of AEFI with blood grouping among population of south-west Delhi, India: A descriptive cross-sectional study.: To estimate prevalence of adverse effects following Covid-19 vaccination and their association with ABO-Rh blood grouping if any. Int. J. of Res. in Pharmacology &Pharmacotherapeutics . 2022;11(3):135-140. doi:10.61096/ijrpp.v11.iss3.2022.135-140