Mycobacterium tuberculosis can cause significant infections in liver transplant candidates and recipients. Its nonspecific clinical features and prolonged growth time in culture make the diagnosis difficult, and treating tuberculosis (TB) remains challenging because of significant toxicities and drug-drug interactions. The diagnosis of a latent TB infection may be accomplished with tuberculin skin testing and with the newer interferon-c release assays, although this infection may be underrecognized because of host factors. Latent TB should be treated, but the degree of liver failure and the likelihood of progression to active TB will dictate whether this should occur before or after transplantation. Patients who have a history of TB, have used muromonab-CD3 or anti-T lymphocyte antibodies, or have experienced allograft rejection or coinfection with cytomegalovirus, Pneumocystis jiroveci, or Nocardia are at the greatest risk of developing active TB. Active TB in transplant patients is difficult to treat because of drug-induced hepatotoxicity and the significant interaction between rifampin and calcineurin inhibitors. In this article, we review the epidemiology, clinical features, and evaluation of transplant candidates and recipients. In addition, we offer recommendations on the appropriate diagnostic and treatment regimens for patients with latent and active TB infections. Liver Transpl 16:1129-1135, 2010. V C 2010 AASLD.Received April 5, 2010; accepted July 6, 2010.Tuberculosis (TB) is a serious global infection with an estimated prevalence of 13.7 million cases worldwide. 1 Transplant recipients have a 36-to 74-fold higher risk of developing TB versus the general population. 2 TB in liver transplant recipients presents unique challenges, including a delayed diagnosis secondary to insensitive testing and treatment complications due to antituberculous drug toxicities and interactions with immunosuppressive agents. This review focuses on the epidemiology, clinical features, diagnosis, clinical evaluation, and treatment of liver transplant patients infected with TB.
EPIDEMIOLOGYRates of 0.47% to 2.3% for active TB in adult liver transplant recipients has been reported. [2][3][4][5] Because of the difficulty of accurately diagnosing symptomatic TB, these figures most likely underestimate the burden of the disease. In addition, the frequency of the disease varies geographically, with particular regions (Asia and Africa) having a higher prevalence than other areas of the world. 6 Several factors place transplant patients at greater risk of developing active TB.A previous TB infection increases the likelihood of TB developing after transplantation. 5 The RESITRA (Spanish Network of Infection in Transplantation) cohort documented a relative risk of 4.3 for the development of symptomatic TB when the purified protein derivative (PPD) test was positive instead of negative. 4 In a systematic review of 139 cases of active TB infection after liver transplantation, 37% had a positive tuberculin skin test (TST), 23% had abnorm...