A sterile pharmaceutically acceptable aqueous solution, which solution is provided in a sealed container and comprises: a pharmaceutically acceptable aqueous solvent； viral particles or a physiologically active polypeptide； an excipient selected from a polyethyleneimine； a compound of formula (I) or a physiologically acceptable salt or ester thereof； or a compound of formula (II) or a physiologically acceptable salt or ester thereof； and optionally, one or more sugars.
