Abstract: The present invention discloses a quick, simple, qualitative and semi-quantitative immunologic method and device in a field test kit format for the detection and the stage of infection of certain protozoal, viral, bacterial, or nematodal pathogens in body fluids, using vaccines specific to such pathogens as antigens. The method comprises immobilizing an antigen specific to a selected protozoal, bacterial, viral or nematodal pathogen on a support membrane, obtaining a sample of a body fluid from a human or animal suspected of harboring the pathogen, thus containing antibodies thereto, contacting the antigen with the sample of body fluid and detecting the binding of the antigen with the antibodies by any suitable means. The device comprises a rigid member, an absorbent layer, a foam layer and a support member on which the antigen is immobilized, glued together to form a compact assembly.