The United Nations Children’s Fund says schools in 23 countries, with 405 million pupils, are still partially or fully closed because of COVID.
The charity, UNICEF, estimates 147 million children have missed at least half of their in-person schooling.
Some vulnerable children, especially girls, have not returned to those schools that have reopened.
UNICEF Executive Director Catherine Russell says children are “the hidden casualties of the pandemic”.
While children have been less vulnerable to the most serious health effects of coronavirus, their lives have been turned upside down by the school closures of the pandemic.
In March 2020, 150 countries around the world completely shut their schools, with partial closures in a further 10.
Two years later, 19 still have some of their schools closed. In a further four – the Philippines, Honduras, Solomon Islands and Vanuatu in the South Pacific – at least 70% remain shut, the proportion UNICEF categorises as full closure.