By Amedeo Lomonaco Vaccines were developed as a public good and must be provided to all in a fair and equitable manner, giving priority to those who need them most. This is what the Vatican's Covid-19 Commission and the Pontifical Academy for Life have highlighted in a joint document that discusses the essential role of the anti-covid vaccine to defeat the pandemic. Referring to the Pope’s recent Christmas Message, world leaders are exhorted to reject the temptation to promote “various forms of nationalism” regarding the vaccine, and to cooperate in its distribution. As he said on 25 December, “for these lights to illuminate and bring hope to all, they need to be available to all.”