Reaffirming the significance of global public goods for health: Global solidarity in response to Covid-19 and future shocks Obijiofor Aginam, Sainath Banerjee, Alex Ezeh, Sandro Galea, Blessing Mberu, Blaise Nguendo-Yongsi, Osondu Ogbuoji, K. Srikanth Reddy, Margo Thomas, Gavin Yamey, Yonette Thomas, Franz Gatzweiler Policy Brief