g can cause life threatening anaphylaxis in some people the present invention is the aerosol administration by metered dose inhaler or nebulizer of by product immunoglobulin a for the prevention or treatment of diseases including immunodeficiencies and infections antigen specific monoclonal immunoglobulin a may be used immunoglobulin a from any of the aforementioned sources may then be coupled with recombinant j chain and may then be additionally coupled with recombinant secretory component in order to render the immunoglobulin a more physiologically active immunoglobulin a with or without j chain and secretory component is then administered by aerosol inhalation application_number US 81502601 A description the following description of the preferred embodiment s is merely exemplary in nature and is in no way intended to limit the invention its application or uses in one embodiment the invention provides a method for medical treatment of humans comprising the step of administering by inhalation an aerosol composition the aerosol composition contains an iga component which can be derived from a number of sources the aerosol composition contains an iga component which can be derived from a number of sources the by product is obtained from pooled human plasma following cohn cold ethanol fractionation to produce fraction iii precipitate as performed by those of skill in the art of protein separation iga by product is further purified by adsorption onto a ion exchange medium in neutral or slightly acidic conditions as performed by those of skill in the art of protein purification a more detailed description of isolation of an.