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Introduction: Cytomegalovirus (CMV) reactivation is one of the most common complications after allogeneic hematopoietic stem cell transplantation (HSCT). Letermovir is approved for CMV prophylaxis among high-risk recipients. However, delayed-onset post-prophylaxis clinically significant CMV infection (csCMVi) has been observed, suggesting the potential for extending letermovir prophylaxis beyond the first one hundred days post-HSCT., Methods: Retrospective multicenter cohort study of allogeneic HSCT patients from August 2018 to March 2023. The primary aim of this study was to identify the risk factors at day 100 associated with delayed onset csCMVi, in patients who received letermovir prophylaxis up to day 100. Competing risk analysis was used to evaluate incidence with specific risk factors, using Gray's Test comparing groups for each event., Results: Among 166 eligible allogeneic HSCT recipients, the most common primary hematological diagnosis was acute myelogenous leukemia (AML) (42.2%). Twenty-six (15.7%) developed a breakthrough csCMVi. Delayed-onset csCMVi occurred in 23.5%, at a median time of 133 days after SCT. On multivariate analysis, having a matched unrelated donor (odds ratio [OR] 2.46) and a CMV donor negative/recipient positive status (OR 3.47) were associated with delayed onset csCMVi. In contrast, AML had a lower odd of having delayed-onset csCMVi (OR 0.23)., Conclusions: Having a matched unrelated donor, a CMV donor negative/recipient positive status, and a non-AML underlying disease were associated with delayed onset csCMVi. Prospective studies are needed to evaluate whether extended letermovir prophylaxis is beneficial for these patients., (© 2024 Wiley Periodicals LLC.)

In 2022, the largest global outbreak of mpox to date emerged. In the immunocompetent host, mpox generally presents as a self-limiting illness. However, immunosuppression, such as that seen with advanced HIV, has been associated with significant morbidity and mortality related to mpox infection. To evaluate the impact of immunosuppression related to solid organ transplantation on clinical features and outcomes of mpox we established a multicenter case registry. Eleven cases from 7 participating centers in the USA were submitted. All cases occurred in males. The majority were kidney transplant recipients (91%, n = 10). Median duration of symptoms at presentation was 6 days (range, 3-14 days). Rates of hospitalization were high (73%, n = 8) with a median length of stay of 4.5 days (range, 1-10 days). Mpox in solid organ transplant recipients was associated with a high burden of skin lesions and systemic symptoms. Fever, fatigue, pharyngitis, and proctitis were commonly reported. Other clinical features included headache, myalgia, epididymo-orchitis, urinary retention, hematemesis, pneumonitis, and circulatory shock. All patients received treatment with tecovirimat. There was 1 mpox-related death in the cohort. Infection was reported to have resolved at 30-day follow-up in all other cases., (Copyright © 2023 American Society of Transplantation & American Society of Transplant Surgeons. Published by Elsevier Inc. All rights reserved.)

Introduction: Cytomegalovirus (CMV) causes significant morbidity in solid organ transplant recipients (SOTR). Measuring cell-mediated immunity (CMI) may inform the risk of CMV infection after antiviral prophylaxis and predict relapse after CMV treatment., Methods: We serially assessed CMV CMI using the QuantiFERON-CMV assay (QF-CMV; Qiagen, Germantown, MD) in two cohorts of SOTRs: during valganciclovir prophylaxis and during treatment of CMV viremia. Results of CMI were correlated with post-prophylaxis CMV infection and post-treatment relapse, respectively., Results: Only one (4.2%) of 24 CMV D+/R- patients demonstrated positive QF-CMV by the end of valganciclovir prophylaxis. Four (16.6%) patients developed post-prophylaxis CMV infection; all four had undetectable QF-CMV at end of prophylaxis. Among 20 patients treated for CMV infection, 18 (90%) developed QF-CMV levels >.2 IU/mL by end of antiviral treatment and none developed CMV relapse. In contrast, the single patient who relapsed after completing treatment had a CMV CMI <.2 IU/ml (p = .0036)., Conclusion: Since CMV D+/R- SOTRs are unlikely to develop adequate CMV CMI while receiving valganciclovir prophylaxis, the utility of CMV CMI monitoring for risk stratification during time of prophylaxis had limited value. Conversely, CMV CMI testing may be a useful marker of the risk of CMV relapse after antiviral treatment., (© 2023 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.)

Background: Scedosporium is a lesser-known non-Aspergillus genus of mold that can present in unsuspecting ways. If overlooked, it may disseminate and cause high mortality in high-risk allogeneic stem cell transplant recipients., Case Presentation: This case report describes a 65-year-old patient with Acute Myeloid Leukemia who underwent an allogeneic hematopoietic stem cell transplant after a period of prolonged neutropenia with fluconazole prophylaxis. She suffered severe debility with altered mentation from a S. apiospermum infection which likely disseminated from a toe wound to the lung and central nervous system. She was successfully treated with liposomal amphotericin B and voriconazole, but faced a prolonged recovery from physical and neurologic sequela., Conclusions: The case highlights the importance of adequate anti-mold prophylaxis in high-risk patients, and the value of a thorough physical examination in this patient population, with particular attention to skin and soft tissue findings., (© 2023. The Author(s).)

Background: During the COVID-19 pandemic, efforts to maintain solid-organ transplantation have continued, including the use of SARS-CoV-2-positive heart donors., Methods: We present our institution's initial experience with SARS-CoV-2-positive heart donors. All donors met our institution's Transplant Center criteria, including a negative bronchoalveolar lavage polymerase chain reaction result. All but 1 patient received postexposure prophylaxis with anti-spike monoclonal antibody therapy, remdesivir, or both., Results: A total of 6 patients received a heart transplant from a SARS-CoV-2-positive donor. One heart transplant was complicated by catastrophic secondary graft dysfunction requiring venoarterial extracorporeal membrane oxygenation and retransplant. The remaining 5 patients did well postoperatively and were discharged from the hospital. None of the patients had evidence of COVID-19 infection after surgery., Conclusion: Heart transplants from SARS-CoV-2 polymerase chain reaction-positive donors are feasible and safe with adequate screening and postexposure prophylaxis., (Copyright © 2023 Elsevier Inc. All rights reserved.)

Background: We reviewed the scientific literature to gain insight on the epidemiology and outcome of Strongyloides stercoralis infections after transplantation., Methods: CINAHL, PUBMED, and OVID/MEDLINE were reviewed from inception through March 31, 2022 using key words Strongyloides and transplantation., Results: Our review identified 108 episodes of Strongyloides infection among 91 solid organ transplant (SOT) and 15 hematopoietic cell transplant (HCT) recipients. Median time to infection was 10.8 (range, .14-417) and 8.8 (range, 0-208) weeks after SOT and HCT, respectively. Gastrointestinal symptoms were frequent (86/108 [79.6%]), while skin rash (22/108 [20.3%]) and fever (31/103 [30%]) were less common. Peripheral eosinophilia was observed in half of patients (41/77 [53.2%]). Bacteremia (31/59 [52.5%]) was frequently due to Gram-negative organisms (24/31 [77.4%]). Abnormal chest radiologic findings were reported in half (56/108 [51.9%]). The majority had hyperinfection syndrome (97/108 [89.8%]) while disseminated strongyloidiasis was less common (11/108 [10.2%]). Thirty-two cases were categorized as donor-derived infection (DDI), with donors (23/24 [95.8%]) who had traveled to or lived in endemic areas. Median time to DDI was 8 weeks (range .5-34.3 weeks) after transplantation. Treatment consisted of ivermectin (n = 26), a benzimidazole (n = 27), or both drugs (n = 28). There was high all-cause mortality (48/107, 44.9%) and a high Strongyloides-attributable mortality (32/49, 65.3%)., Conclusions: Strongyloidiasis should be strongly considered among recipients with epidemiologic risk factors for infection, even in the absence of eosinophilia or rash. A policy that provides guidance on pro-active screening is needed, to ensure preventive measures are provided to recipients at increased risk., (© 2022 The Authors. Clinical Transplantation published by John Wiley & Sons Ltd.)

Purpose of Review: Coronavirus disease-2019 (COVID-19) disproportionately causes severe outcomes in solid organ transplant recipients (SOTR). Antispike monoclonal antibodies have been authorized for therapy and prophylaxis for COVID-19. Here, we review the current state of antispike monoclonal antibodies and their role for SOTRs., Recent Findings: Bamlanivimab with or without etesevimab, casirivimab-imdevimab and sotrovimab have reduced the rates of hospitalization and severe disease in high-risk patients with mild-to-moderate COVID-19. Multiple retrospective studies have also demonstrated monoclonal antibodies are effective in SOTR populations. However, the evolution of resistant severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants of concerns has resulted in revocation of the authorization of bamlanivimab with or without etesevimab, and casirivimab-imdevimab as treatment and postexposure prophylaxis (PEP). Sotrovimab and bebtelovimab are currently authorized for treatment of the predominant circulating SARS-CoV-2 B.1.1.529 (Omicron), but not as pre or PEP. Tixagevimab-cilgavimab, a long-acting antibody combination preparation, is authorized for preexposure prophylaxis in high-risk immunocompromised populations, including SOTRs, who are less likely to mount an effective immune response following vaccination series and booster., Summary: Antispike monoclonal antibodies are useful for the prevention and treatment of mild-to-moderate COVID-19 in SOTRs. However, their clinical use should be determined by the evolving epidemiology of SARS-CoV-2 variants in the community., (Copyright © 2022 The Author(s). Published by Wolters Kluwer Health, Inc.)

Background: Solid organ transplant (SOT) recipients are at increased risk for complications from SARS-CoV-2 infection. Little is known regarding clinical course and outcomes of breakthrough COVID-19 in the fully vaccinated SOT population. We sought to describe our cohort of SOT recipients who developed symptomatic breakthrough COVID-19 after full vaccination., Methods: We conducted a retrospective review of SOT recipients diagnosed with COVID-19 at least 14 days after completing SARS-CoV-2 vaccination. Patients were analyzed according to those presenting with mild-to-moderate and severe COVID-19, respectively. We described presenting characteristics, COVID-19 therapy, and analyzed outcomes including emergency department (ED) visits, hospitalization, and intensive care unit (ICU) admission., Results: Thirty-five patients met inclusion criteria. These had a mean age of 60.8 years and kidney transplant was the most common SOT type. Five patients presented with severe COVID-19 at diagnosis, all requiring hospitalization without ICU admission. From the 30 patients who presented with mild-to-moderate infection, 28 received casirivimab-imdevimab. Four of these 28 (14.3%) had an ED visit, with one requiring hospital admission (3.4%). No patients required ICU admission., Conclusion: Breakthrough COVID-19 may occur in SOT recipients after full vaccination, though they appear to have acceptable outcomes. Anti-spike monoclonal antibody therapy for eligible SOT patients may have mitigated clinical progression and improved the outcomes. Further study with large cohorts is warranted., (© 2021 Wiley Periodicals LLC.)