The disease so developing or manifesting itself in those cases shall in no case be attributed to any disease existing prior to that development or manifestation. (b) Any safety member, firefighter, county probation officer, or member active in law enforcement described in subdivision (a) permanently incapacitated for the performance of duty as a result of a blood-borne infectious disease shall receive a service-connected disability retirement. (c) The presumption described in subdivision (a) is rebuttable by other evidence. Unless so rebutted, the board is bound to find in accordance with the presumption. (d) -Blood-borne infectious disease,-for purposes of this section, means a disease caused by exposure to pathogenic microorganisms that are present in human blood that can cause disease in humans, including, but not limited to, those pathogenic microorganisms defined as blood-borne pathogens by the Department of Industrial Relations.

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