realizes biological process biological_process disease disease course disease course replace 'OBI:occurrence of disease', need to add logical definition The axioms of OBI occurence of disease: Equivalent classes: realizes some disease Superclasses: 'has part' some 'pathologic process' 'has participant' some (organism and ('has role' some 'host of immune response role')) biological_process realizes some 'host of immune response role' The totality of all processes through which a given disease instance is realized.