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 [Internet]. 2022 Sep. 10 [cited 2025 Dec. 19];11(3):135-40. Available from: https://ijrpp.com/ijrpp/article/view/440