Table 3.

- Risk stratification of microbial transmission from donor to recipient in liver transplantation (LT).

Risk classification	Description
Unacceptable risk	Diseases with no definitive treatment, such as HIV, MDR bacterial infections, and some viral CNS infections. Encephalitis without proven cause falls in this category, as well as active tuberculosis
Increased but acceptable risk	Justified by the severity of the recipient condition and risk of death. Examples are HCV and HBV in the donor.
Calculated risk	When recipients have the same disease as the donor or in cases where the infection can be mitigated by antibiotics, such as septicemia and bacterial meningitis.
Non-assessable risk	When the risk cannot be estimated based on donor data, such as organs from donors with highly resistant bacteria or fungal infection. The use of these organs should be avoided.
Standard risk	Donors whose evaluation did not reveal transmissible disease.

HIV: human immunodeficiency virus, MDR: multi drug-resistant, HCV: hepatitis C virus