A method for manufacturing a fraction comprising the proteins lactoferrin and/or lactoperoxidase from a source containing at least one of these proteins wherein the source is selected from the group consisting of milk, colostrum, acid or sweet whey, by means of a chromatographic separation process with a monolithic column having cation exchanger properties, wherein in the separation process a pH gradient or a combined pH and salt gradient elution is employed after loading the source to the column.

Further disclosed is a composition of matter comprising lactoferrin having a C value of >60% and A value of >1% or lactoperoxidase.

The present invention relates to products and processes for the treatment or prevention of viral infection(s). In particular the invention relates to the use of one or more proteins, typically obtained from milk, for the treatment or prevention of viral infection(s). In particular embodiments the invention uses combinations of milk proteins for the treatment or prevention of viral infection(s). The products of the invention may be used in combination with other active agents, including other antiviral agents.