@article{{MRA}{}, author = {Chacon-Cruz, E., Lopatynsky-Reyes, E., Hernandez-Ruiz, Y.}, title = { Vaccination: A Legacy of Success and Persistent Challenges, 50 Years Since the Launch of the Expanded Programme on Immunization}, journal = {Medical Research Archives}, volume = {13}, number = {3}, year = {2025}, doi = {10.18103/mra.v13i3.6311}, url = {https://esmed.org/MRA/mra/article/view/6311} }