NOVELTY - A bacteria of Flavobacteria genus or Pseudomonas genus, capable of degrading organic matter and suppressing proliferation of pathogenic microorganism and pathogenic virus, is new.    USE - As agent for purifying the raising environment of animal, as growth inhibitor of pathogenic microorganism or virus, as agent for decomposing the organic matter, as growth stimulant of animal, as feed additive, and in feed (claimed), for preventing infectious disease in livestock, fish, pets and domestic fowl, where the pathogenic bacteria includes Vibrio anguillarum, Edwardsiella tarda, Salmonella enteritidis, saprolegina diclina and Dermocystidium anguillae and the pathogenic virus includes infectious hematopoietic-organ necrosis virus (IHNV), influenza virus, iridovirus (LCDV), noda virus (SJNNV) and rhabdovirus (HIRRV).    ADVANTAGE - The bacteria cleans the environment by promoting the degradation of organic matter, and suppresses the proliferation of pathogenic microorganism or virus.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) feed or feed additive containing the above-cited bacteria, culture of the bacteria or its processed material;    (2) purification agent of raising environment of animal, comprising the above-cited bacteria, culture of the bacteria or its processed material;    (3) growth inhibitor of pathogenic microorganism or pathogenic virus, comprising the above-cited bacteria, culture of the bacteria or its processed material;    (4) decomposition agent of organic matter, containing the above-cited bacteria, culture of the bacteria or its processed material; and    (5) growth stimulant of animal, containing the above-cited bacteria, culture of the bacteria or its processed material.    DESCRIPTION OF DRAWING(S) - The figure shows the graph representing the survival rate of iridovirus infected seabream fish administered with feed containing Flavobacteria sp BC-07 strain or with bacteria free feed. (Drawing includes non-English language text)