Abstract: A concentration membrane for use in concentrating biological particles, including: a hydrophilic composite porous membrane including: a porous substrate; and a hydrophilic resin with which at least one main surface and inner surfaces of pores of the porous substrate are coated, the hydrophilic composite porous membrane having a ratio t/x of a membrane thickness t (m) to an average pore diameter x (m), as measured with a perm porometer, of from 50 to 630.
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