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. International Journal of Research in Pharmacology & Pharmacotherapeutics, [S. l.], v. 11, n. 3, p. 135–140, 2022. DOI: 10.61096/ijrpp.v11.iss3.2022.135-140. Disponível em: https://ijrpp.com/ijrpp/article/view/440. Acesso em: 17 apr. 2026.