The present invention provides a method for purifying virus particles from host cells infected with virus, wherein the virus particles are treated with benzonase and polyethylene glycol and the use of said purified viruses for therapeutic compositions.

The present invention relates to a method for producing stabilised vaccines, the method comprising: (a) mixing antigens with a solution comprising: (i) chitosan; (ii) at least three different amino acids and/or at least one dipeptide or tripeptide; and (iii) a sugar; and (b) drying the mixture obtained in (a).