You must specify the antigen of A. fumigatus for which you need antiserum. The vegetative and sporulation stage of fungus shall contain different antigens and hence there shall be different Sera.

You may read this article and identify the antigen for which you need antiserum. Quantification of IgG Antibodies to Aspergillus fumigatus and Pigeon Antigens by ImmunoCAP Technology: An Alternative to the Precipitation Technique?

Erna Van Hoeyveld, Lieven Dupont, Xavier Bossuyt

DOI: 10.1373/clinchem.2006.067546 Published August 2006

Thanks for the specification! We are working with the antigen derived from sporulation stage correlated with a APBA or aspergilloma. Thats why we need ASPERGILLINA and antiserums normalized from patients with these diseases. We apply the Ouchterlony technique.

Institute Pasteur used to sell those kits, not longer available over there.