The COVID-19 pandemic and related disruptions have weakened health systems, with 25 million children not receiving vaccination in 2021, 5.9 million more compared to 2019 figures and the highest number since 2009, according to the World Health Organization (WHO). Though the pandemic has had a devastating effect on services for health and immunisation worldwide, one in eight children was zero-dose — not received a vaccine of any kind — even before. An estimated 19.7 million children under the age of one year did not receive basic vaccines, according to 2019 WHO figures. View More