Interim recommendations for an extended primary series with an additional vaccine dose for COVID-19 vaccination in immunocompromised persons: interim guidance, 26 October 2021

Citation
World Health Organization. (2021). Interim recommendations for an extended primary series with an additional vaccine dose for COVID-19 vaccination in immunocompromised persons: interim guidance, 26 October 2021. World Health Organization. https://iris.who.int/handle/10665/347079. License: CC BY-NC-SA 3.0 IGO