characteristic of inheres in role secondary infection role The role is realized in a process by which the infectious disorder is established in the host. Lindsay Cowell Albert Goldfain A role borne by an infectious disorder in virtue of the fact that (1) the host has at least two distinct infectious disorders, where neither arose from the other through metastasis, (2) at the time the infectious disorder was established in the host, the host had a primary infectious disorder, and (3) establishment of the infectious disorder occurs because of increased susceptibility to infectious disorders conferred by the primary infectious disorder. Alexander Diehl infectious disorder host role source of infection role