Mouse Anti-F. psychrophilum Monoclonal antibody for IF. There is strong evidence that Flavobacterium psychrophilum, the etiologic agent of coldwater diseas (CWD), is transmitted vertically and it has been hypothesized that disease management at hatchery facilities may be improved through broodstock screening and implementation of culling programs. GM44 was selected for assay development and shown to react with 67 F. 31 psychrophilum isolates tested, but did not react with two strains of Flavobacterium columnare or 32 one strain each of F. pectinovorum, F. aquatile, F. branchiophilum, and F. saccharophilum.