Global development EAs were very much looking into vaccines around 2015 and then and now it seemed that the malaria vaccine is just not crazy cost-effective, because you have to administer it more than once and it’s not 100% effective—see
Public health impact and cost-effectiveness of the RTS,S/AS01 malaria vaccine: a systematic comparison of predictions from four mathematical models
Modelling the relative cost-effectiveness of the RTS,S/AS01 malaria vaccine compared to investment in vector control or chemoprophylaxis
Global development EAs were very much looking into vaccines around 2015 and then and now it seemed that the malaria vaccine is just not crazy cost-effective, because you have to administer it more than once and it’s not 100% effective—see
Public health impact and cost-effectiveness of the RTS,S/AS01 malaria vaccine: a systematic comparison of predictions from four mathematical models
Modelling the relative cost-effectiveness of the RTS,S/AS01 malaria vaccine compared to investment in vector control or chemoprophylaxis