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Infection of the anogenital tract with human papillomavirus (HPV) is very common. Approximately 15–20 anogenital HPV types are oncogenic or “high-risk” and are associated with 99.9% of cervical cancers, 90% of anal cancers, 70% of oropharyngeal cancers, and a high proportion of vaginal, penile, and vulvar cancers. Defects in cellular immunity make solid organ transplant (SOT) recipients particularly susceptible to persistent high-risk HPV infection, development of the cancer precursor...

Human herpesvirus 5, better known as cytomegalovirus (CMV), infects 50–90% of the adult population worldwide and is the most common opportunistic infection in allogeneic hematopoietic stem cell transplant (HSCT) recipients, causing significant morbidity and mortality [1–6]. Without prophylaxis, CMV reactivation occurs in up to 70–80% of CMV-seropositive individuals [6–9]. This chapter will review the current understanding of CMV infection in HSCT recipients focusing on emerging concepts and...

The purpose of this review is to describe the characteristics of dengue (DENV), chikungunya (CHIKV), and Zika (ZIKV) in transplant recipients. The majority of reported cases were transmitted by mosquito bite, but blood and graft transmission may occur. These arbovirus infections are clinically similar, resembling influenza-like illness or frequent transplant syndromes. Therefore, laboratory confirmation is necessary. In the acute phase, nucleic acid tests are preferred. DENV and ZIKV serology...

Polyomavirus-associated nephropathy (PyVAN) and hemorrhagic cystitis (PyVHC) occur almost exclusively after kidney transplantation (KT) and allogeneic hematopoietic stem cell transplantation (HSCT), respectively. In addition, PyV-associated urothelial cancer (PyVUC) is emerging after KT. These diseases are attributed to BK polyomavirus (BKPyV), a small non-enveloped, doublestranded DNA virus infecting >90% of the general population followed by renal persistence. PyVAN causes premature...

Human herpesviruses (HHV)-6, HHV-7, and HHV-8 were identified as causes of infection in solid organ transplant (SOT) and hematopoietic stem cell transplant (HSCT) recipients nearly three decades ago. HHV-6 infection occurs early posttransplant and may cause fever of unknown origin, diarrhea, rash, pneumonitis, and encephalitis. Chromosomal integration of HHV-6 can complicate diagnostic testing for HHV-6, as these patients have markedly elevated HHV-6 DNA levels due to the presence of HHV-6...

Solid organ and hematopoietic stem cell transplant recipients are at high risk of contracting infectious diseases, including vaccine-preventable illnesses, in the post-transplant period. Given the high degree of immunosuppression immediately post-transplant, infection in the transplant patient results in higher morbidity and mortality than in the general population. Thus, it is the responsibility of the care team to ensure appropriate vaccines are given in an attempt to mitigate this risk....

Hepatitis B virus (HBV) and hepatitis D virus (HDV) are hepatotropic viruses that can have a significant impact on patients undergoing solid organ and hematopoietic stem cell transplants. In the setting of transplant immunosuppression, patients with HBV or HDV coinfection can have acceleration in the natural history of their liver diseases with increased risk of developing cirrhosis, decompensation, and hepatocellular carcinoma. Immunosuppression can also reactivate HBV in patients with...

Cytomegalovirus (CMV) is among the most common of infections after transplant. In addition to causing viral infection, it increases the risk for a negative outcome for the organ or bone marrow graft, as well as for higher overall morbidity and mortality. Risk of CMV is especially high in transplant recipients previously nonimmune to the virus. Prevention is key for optimal outcomes, both for individuals and for transplant programs. Optimal disease recognition, diagnostics, prevention, and...

Infections are an important cause of morbidity and mortality after transplantation. Some of these infections are environmental and geographically or seasonally important. West Nile virus is one such infection, tied to the epidemiology of infected mosquitos which varies over time. It can cause disease for a transplant recipient either from direct inoculation from an infected mosquito or as a donorderived infection. This chapter reviews current data about the epidemiology of West Nile virus,...

Infections due to adenoviruses confer significant morbidity and mortality in immunocompromised hosts. Manifestations of disease in the setting of hematopoietic stem cell and solid organ transplantation may range from asymptomatic shedding or viremia to localized infection and disseminated disease. In solid organ transplant recipients, adenoviral disease often involves the allograft and can lead to graft dysfunction and/or graft loss. Several diagnostic methods are available for adenovirus...

The hepatitis E virus (HEV) is one of the main causative agents of acute viral hepatitis worldwide. Over the past decade, HEV genotypes 3 and 4 have been responsible for chronic infections in immunocompromised patients, especially solid organ transplant recipients. A rapid progression of liver fibrosis and the development of HEV-related cirrhosis have been documented in this specific population. HEV infections have also been associated with extrahepatic manifestations such as neurological...

Transplantation in recent years has become a viable option to treat end stage organ failure in people living with HIV infection. Significant advances in the understanding of appropriate immunosuppression management and infection prevention have resulted in graft and patient survival comparable to HIV-negative recipients in many cases. Given the higher incidence of end stage organ disease in HIV positive patients, particularly liver cirrhosis and dialysis dependent renal failure, transplant...

Influenza virus is a common respiratory virus in solid organ and stem cell transplant recipients. Influenza infection in immunocompromised hosts can result in severe disease, as compared to general population. Risk factors for severe influenza infection in transplant recipients include treatment with antilymphocyte globulin, presence of lower respiratory disease, and infection early after transplantation. Transplant programs should act to optimize prevention, early diagnosis, and treatment of...

Respiratory viruses are among the most common causes of infection among solid organ and hematopoietic stem cell transplant recipients. Respiratory viruses, such as influenza and respiratory syncytial virus, can cause a range of disease from asymptomatic shedding, upper respiratory infections, to life threatening pneumonia. In addition, respiratory viruses may be associated with chronic sequelae, including devasting late complications such as chronic rejection in lung transplant recipients and...

Chronic hepatitis C virus (HCV) infection related liver diseases are a leading indication for liver transplantation (LT) worldwide, responsible for about 20% of all LT performed in Europe and the United States. In the context of liver transplantation, treatment of HCV infection has been classically challenging because of therapies’ low efficacy and safety concerns associated with interferon-based regimens, so that patients with decompensated cirrhosis and liver graft recipients have been...

Respiratory syncytial virus (RSV) causes significant morbidity and mortality in immunocompromised hosts with particular burden among allogeneic hematopoietic stem cell transplant and lung transplant recipients. Affected patients have a substantial risk of secondary infection, ICU admission, or death. Improved diagnostic testing with better sensitivity has given new insights into the epidemiology of disease. In particular, it has highlighted the issue of nosocomial transmission and hospital...

Herpes Simplex Virus (HSV) 1 and 2 and Varicella Zoster Virus (VZV) are ubiquitous alpha-herpes viruses that establish lifelong latency in nerve root ganglia. They are characterized by clinical and subclinical reactivation which can lead to significant morbidity in the transplant population. Primary infection after transplant can also be highly morbid, potentially fatal. Despite significant advances in screening, diagnosis, treatment and prevention, there are further gains to be made in...

Hepatitis A (HAV) is vaccine-preventable disease with an ongoing burden of disease nationally and worldwide. It is caused by a non-enveloped RNA virus with predominantly fecal-oral spread. It does not cause chronic disease and symptomatic infection increases with age. Fulminant disease and death are more common in the elderly and comorbid, particularly those with underlying chronic liver disease. Immunity to HAV infection occurs after infection or vaccination, with antibody levels indicating...