Acute acalculous cholecystitis following extended administration of nirmatrelvir/ritonavir for persistent SARS-CoV-2 infection.

Immunocompromised patients with hematologic malignancies, particularly those treated with anti-CD20 antibodies such as rituximab and obinutuzumab, are known to be at risk of prolonged infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Prolonged administration or combination therapy with antiviral medications reportedly yields favorable outcomes in these patients. However, knowledge regarding the adverse events associated with such therapeutic approaches is limited. Herein, we report a case of acute acalculous cholecystitis (AAC) following extended administration of nirmatrelvir/ritonavir (NMV/r) in a 68-year-old Japanese man with persistent SARS-CoV-2 infection. The patient had received obinutuzumab and bendamustine for follicular lymphoma and was diagnosed with coronavirus disease 2019 (COVID-19) approximately one year after treatment initiation with these drugs. Subsequently, he was admitted to a different hospital, where he received antiviral drugs, monoclonal antibodies, and steroids. Despite these interventions, the patient relapsed and was subsequently transferred to our hospital due to persistent SARS-CoV-2 infection. Remdesivir administration was ineffective, leading to the initiation of extended NMV/r therapy. One week later, he exhibited elevated gamma-glutamyl transpeptidase (GGT) levels, and one month later, he developed AAC. Cholecystitis was successfully resolved via percutaneous transhepatic gallbladder drainage and administration of antibiotics. We speculate that extended NMV/r administration, in addition to COVID-19, may have contributed to the elevated GGT and AAC. During treatment of persistent SARS-CoV-2 infection with extended NMV/r therapy, patients should be carefully monitored for the appearance of findings suggestive of biliary stasis and the development of AAC.

Characteristics of preventive intervention acceptance for international travel among clients aged 60 years and older from a Japanese multicenter pretravel consultation registry.

OBJECTIVES: Pretravel consultation (PTC) is important for older adults owing to health problems associated with overseas travel. Although older adults in Japan, their PTC characteristics are less known. This study aimed to investigate the epidemiology of clients aged ≥ 60 years based on data from the Japan Pre-travel Consultation Registry (J-PRECOR). METHODS: Clients aged ≥ 60 years who visited J-PRECOR cooperative hospitals from February 1, 2018, to May 31, 2022, were included. The primary endpoint was a comparison of prescriptions for vaccines for hepatitis A, tetanus toxoid, and malaria prophylaxis in travelers to high-risk malaria countries in yellow fever vaccination (YFV)-available facilities with and without YFV. RESULTS: In total, 1000 clients (median age: 67 years) were included. Although 523 clients were immunized with YFV, only 38.6% of the 961 unimmunized clients were vaccinated with the tetanus toxoid-containing vaccine. Malaria chemoprophylaxis was prescribed to 25.7% of clients traveling for ≤55 days. At YFV-capable institutes, 557 clients traveling to yellow fever risk countries took PTC, 474 of whom received YFV and 83 were unvaccinated. Lower age (odds rate 0.85 per 1 year; 95% CI 0.80-0.90) and lower hepatitis A vaccination rate (0.29; 95% CI 0.14-0.63) were significantly associated with YFV. CONCLUSIONS: Preventive interventions other than YFV should be offered to older adults.

Factors associated with viral clearance periods from patients with COVID-19: A retrospective observational cohort study.

INTRODUCTION: Knowledge is limited on the virologic course of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) infection, particularly the time taken for viral clearance and the optimal time to discontinue isolation. This study aims to identify the clinical and demographic factors influencing the time taken for viral clearance in patients with COVID-19 to determine the optimal isolation period. METHODS: This two-center retrospective observational cohort study was conducted between March 1 and June 31, 2020. Patients with COVID-19, which was confirmed by real-time reverse transcription polymerase chain reaction, were included. Data were extracted from medical records. The positive duration, which was defined as the period from the day of symptom onset to the negative conversion day, was assessed using a generalized linear model. RESULTS: We included 63 patients. The mean positive duration was 20 days. The positive duration was significantly shorter for patients younger than 30 years of age and those between 30 and 60 years of age than for patients older than 60 years of age. We observed a more scattered distribution of the positive duration in older patients than in younger patients. CONCLUSIONS: Younger patients who recovered from COVID-19 took less time to clear SARS-CoV-2 than older patients; thus, a classification of the isolation periods based on age could be considered. A uniform viral clearance period for older patients may be difficult to determine because of biases such as underlying medical conditions. Further surveillance measures are recommended to determine the viral clearance time and the optimal isolation period.

Financial Burden as a Potential Barrier to Vaccine Completion in Post-hematopoietic Stem Cell Transplant Patients in Japan.

Introduction The administration of routine vaccinations to patients following hematopoietic stem cell transplantation (HSCT) is highly recommended. However, studies examining reasons for not completing vaccination in post-HSCT patients are lacking. Method We reviewed the medical records of patients who sought vaccination following HSCT from January 2012 to December 2018 at the Center for Infectious Diseases, Nara Medical University. Results Information regarding patients' backgrounds, administered vaccines, and reasons for not administering recommended vaccines was collected for the study. Thirty-five patients (22 men and 13 women) with a median time from HSCT to the first visit of 25 months were enrolled. Vaccine coverage was highest for diphtheria, tetanus, and acellular pertussis (DTaP) at 89% (31 patients), followed by 23-valent pneumococcal, measles/rubella/mumps, and Japanese encephalitis at 71% (25 patients), 71% (25 patients), and 63% (22 persons), respectively. However, vaccine coverage for hepatitis B, 13-valent pneumococcal, and Hib was low at 26% (three patients), 11% (four patients), and 40% (14 patients), respectively. The reason for not completing the recommended vaccination series was not provided for most cases; however, the economic barrier was cited for all vaccines. Discussion This study identified several cases in Japan where individuals stopped completing post-HSCT vaccinations due to financial constraints. Larger-scale studies may be necessary in Japan in the future for further investigation.

[A case of crescentic poststreptococcal acute glomerulonephritis (PSAGN) accompanied by membranous nephropathy].

In 2010, a 71-year-old man was referred to our hospital because of mild proteinuria and hematuria. At that time, he had been asymptomatic. Three months later he noticed macroscopic hematuria, followed by general malaise, and then anorexia. He was admitted for acute kidney injury (serum creatinine 2.7 mg/dL), marked proteinuria (4.35 g/gCr), and elevated C-reactive protein (7.21 mg/dL). Some vesicles were noted on the soft palate, and a throat culture yielded a growth of group A beta-hemolytic streptococci. Antistreptolysin O and antistreptokinase titers were elevated, but serum complement levels were within normal limits. Antineutrophil cytoplasmic antibodies (ANCA) directed against elastase and bactericidal permeability increasing protein (BPI)were positive. The renal function and inflammation did not improve despite oral antibiotic therapy. Pathological examination of a renal biopsy specimen revealed diffuse crescent formation, numerous subepithelial dome-shaped deposits (humps), and prominent endocapillary proliferation. Furthermore, a focal and segmental spike appearance was seen, with deposits smaller than humps. There was a striking clinical improvement after steroid pulse therapy followed by oral prednisolone. The features of this case strongly suggest crescentic PSAGN accompanied by pre-existing membranous nephropathy.

[A case of drug-induced granulomatous interstitial nephritis during the long course of Crohn's disease].

A 33-year-old man was diagnosed with Crohn's disease in 2001, and treated with mesalazine and ranitidine. Administration of infliximab was started in 2007 and led to a decrease in the activity of the Crohn's disease. He was referred to our department in the summer of 2011 following rapid progression of renal insufficiency, with serum creatinine levels increasing from 1.5 mg/dL to 4.3 mg/dL within 2 months. On admission, laboratory findings showed signs of inflammation, anemia, proteinuria, and hematuria. Renal biopsy results indicated the diagnosis of granulomatous interstitial nephritis. Neither clinical manifestations nor laboratory findings were suggestive of infectious disease, sarcoidosis, Wegener's granulomatosis or tubulointerstitial nephritis and uveitis. Mesalazine and ranitidine were discontinued in view of reports of drug-induced granulomatous interstitial nephritis. Levels of C-reactive protein immediately decreased, but renal function remained unimproved. Treatment with steroid pulse therapy was then initiated, followed by oral prednisolone at 40 mg/day, and his serum creatinine recovered to 2.3 mg/dL. Mesalazine and/or ranitidine appear to have been responsible for the granulomatous interstitial nephritis. In cases of Crohn's disease showing rapid deterioration of renal function, drug-induced renal disease should be considered, even if the drugs have been taken without apparent problems for a long duration.

Chorioamnionitis and early pregnancy loss caused by ampicillin-resistant non-typeable Haemophilus influenzae.

Haemophilus influenzae can cause intra-amniotic infection and early pregnancy loss. The mode of transmission and risk factors for H. influenzae uterine cavity infections are unknown. Here, we present the case of chorioamnionitis caused by ampicillin-resistant H. influenzae in a 32-year-old Japanese woman at 16 weeks of gestation. Despite empirical treatment, including ampicillin, as recommended by the current guidelines, she had fetal loss. The antimicrobial regimen was changed to ceftriaxone, and the treatment was completed without complications. Although the prevalence and risk factors for chorioamnionitis caused by ampicillin-resistant H. influenzae are unknown, clinicians need to recognize H. influenzae as a potentially drug-resistant and lethal bacterium for pregnant women.

THE CRITICAL ROLE OF THE HISTONE MODIFICATION ENZYME SETDB2 IN THE PATHOGENESIS OF ACUTE RESPIRATORY DISTRESS SYNDROME.

ABSTRACT: Introduction: Acute respiratory distress syndrome (ARDS) is a severe hypoxemic respiratory failure with a high in-hospital mortality. However, the molecular mechanisms underlying ARDS remain unclear. Recent findings have indicated that the onset of severe inflammatory diseases, such as sepsis, is regulated by epigenetic changes. We investigated the role of epigenetic changes in ARDS pathogenesis using mouse models and human samples. Methods: Acute respiratory distress syndrome was induced in a mouse model (C57BL/6 mice, myeloid cell or vascular endothelial cell [VEC]-specific SET domain bifurcated 2 [Setdb2]-deficient mice [Setdb2 ff Lyz2 Cre+ or Setdb2 ff Tie2 Cre+ ], and Cre - littermates) by intratracheal administration of lipopolysaccharide (LPS). Analyses were performed at 6 and 72 h after LPS administration. Sera and lung autopsy specimens from ARDS patients were examined. Results: In the murine ARDS model, we observed high expression of the histone modification enzyme SET domain bifurcated 2 ( Setdb2 ) in the lungs. In situ hybridization examination of the lungs revealed Setdb2 expression in macrophages and VECs. The histological score and albumin level of bronchoalveolar lavage fluid were significantly increased in Setdb2 ff Tie2 Cre+ mice following LPS administration compared with Setdb2 ff Tie2 Cre- mice, whereas there was no significant difference between the control and Setdb2 ff Lyz2 Cre+ mice. Apoptosis of VECs was enhanced in Setdb2 ff Tie2 Cre+ mice. Among the 84 apoptosis-related genes, the expression of TNF receptor superfamily member 10b ( Tnfrsf10b ) was significantly higher in Setdb2 ff Tie2 Cre+ mice than in control mice. Acute respiratory distress syndrome patients' serum showed higher SETDB2 levels than those of healthy volunteers. SETDB2 levels were negatively correlated with the partial pressure of oxygen in arterial blood/fraction of inspiratory oxygen concentration ratio. Conclusion: Acute respiratory distress syndrome elevates Setdb2 , apoptosis of VECs, and vascular permeability. Elevation of histone methyltransferase Setdb2 suggests the possibility to histone change and epigenetic modification. Thus, Setdb2 may be a novel therapeutic target for controlling the pathogenesis of ARDS.

Epidemiological trends of traveler's diarrhea in Japan: An analysis of imported infectious disease registry data from 2017-2022.

Traveler's diarrhea (TD) is a global problem, and identifying the causative organisms of TD is important for adequate treatment. Therefore, this study retrospectively analyzed TD cases in patients who returned to Japan after traveling abroad to determine the causative organisms by travel region. We included patients with a final diagnosis of TD registered in the Japan Registry for Infectious Diseases from Abroad database from September 25, 2017, to September 1, 2022, from 14 medical institutions. A total of 919 patients were analyzed; the causative TD pathogen was identified in 188 cases (20%), of which 154 were caused by diarrheagenic bacteria, the most common being Campylobacter spp. (64%). A 2.2 mg/dL C-reactive protein concentration cutoff value had some predictive ability for bacterial TD (negative predictive value, 89%). Therefore, the C-reactive protein level may help rule out bacterial diarrhea and prevent unnecessary antimicrobial administration when patients cannot provide a stool specimen.

Transition of Antibody Titers after SARS-CoV-2 mRNA Vaccination in Japanese Healthcare Workers.

Since February 2021, healthcare workers in Japan have been preferentially vaccinated with a messenger RNA vaccine (BNT162b2; Pfizer/BioNTech) against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). While many studies have confirmed that this vaccine is highly effective in reducing hospitalization and deaths from coronavirus disease 2019 (COVID-19), antibody titers tend to decline at 3 months after vaccination, leading to a risk of breakthrough infections. Thus, information is needed to support the decision regarding the 3rd vaccination. In this study, we investigated the transition of anti-SARS-CoV-2 spike protein receptor-binding domain (RBD) IgG and neutralizing antibody titers in 37 vaccinated Japanese healthcare workers. Samples were collected 6 times starting before vaccination until 6 months after the second vaccination. The levels of anti-SARS-CoV-2 RBD IgG peaked 1 week after the 2nd vaccination, then declined over time and decreased to < 10% at 6 months after the 2nd vaccination. Additionally, approximately one-third of the healthcare workers were seronegative for the Omicron variant 6 months after the 2nd vaccination. Workers with low anti-SARS-CoV-2 RBD IgG levels also had low neutralizing antibody titers. These data support booster dose administration for healthcare workers, especially those with low anti-SARS-CoV-2 RBD IgG levels.

[Clinical characteristics of adult-onset minimal change nephrotic syndrome in our hospital].

OBJECTIVE: Few findings are available regarding adult-onset minimal change nephrotic syndrome (MCNS) with respect to the disease course and complications, such as acute kidney injury (AKI). We therefore performed a retrospective review to characterize the clinical presentations, steroid responsiveness and complications of adult-onset MCNS patients in our hospital. PATIENTS AND METHODS: We retrospectively reviewed 40 cases of idiopathic adult-onset MCNS who had been investigated and treated at a single center. Patients between 18 and 50 years of age (Younger group) at the time of biopsy were compared with those older than 50 years (Older group) with regard to demographic data, clinical features and treatment outcome. RESULTS: Baseline characteristics of the 40 patients were: median age, 42 years (interquartile range: 28-63 years); male, 70%; mean (+/- standard deviation) systolic and diastolic blood pressures, 125 +/- 17 mmHg and 78 +/- 12 mmHg, respectively; estimated glomerular filtration rate (eGFR), 74 mL/min/1.73 m2 (range: 64-94 mL/min/1.73 m2); serum albumin, 1.8 +/- 0.3 g/dL; and urinary protein, 7.8 g/day (range: 3.9-10.4 g/day). All except for one patient received steroid pulse therapy. Time to complete response (CR) was 12 days (range: 8-21 days). Time to CR was significantly longer in the Older group (p = 0.011). The Late-responder group (time to CR > 2 weeks)was significantly older (p < 0.01), with a low eGFR (p < 0.001) and a higher prevalence of interstitial fibrosis in renal biopsy before the initiation of corticosteroid therapy (p < 0.05), compared with the Early-responder group. AKI was observed in 14 patients. Patients with an episode of AKI were significantly older (p = 0.005), with a lower eGFR (p < 0.002) and a higher prevalence of cellular casts (p < 0.05). At the follow-up, 19 patients (51%) had experienced relapses. The relapse rate was significantly lower in the Older group than in the Younger group (p < 0.05). CONCLUSION: The present study revealed that older patients had a longer period to CR and a higher risk of AKI at follow-up.

A survey of healthcare workers' recommendations about human papillomavirus vaccination.

Purpose: The human papillomavirus (HPV) vaccine is safe and effective for preventing HPV-related diseases. However, HPV vaccination rates in Japan are low because the "Ministry of Health, Labour and Welfare" had stopped recommending vaccination. We assessed healthcare workers' (HCWs) current recommendations regarding the HPV vaccine and how the provision of information about HPV vaccination affected their recommendations. Materials and Methods: A survey was conducted among nurses and physicians in Nara prefecture from March 2021 to July 2021. The questionnaire asked about their understanding, recommendations, and opinions regarding HPV vaccination. Before answering the last two questions (optional), the HCWs read evidence-based information quantifying the risks and benefits of HPV vaccination. Results: A total of 441 HCWs completed the questionnaire. Only 19% of HCWs always recommended HPV vaccination for girls aged 12-16 years. The evidence-based information significantly improved the percentage of HCWs who would "always recommend" vaccination. Conclusion: This study showed that the proportion of HCWs who recommend HPV vaccination to adolescent girls remains low in Japan. However, we found that evidence-based information describing the causal relationship between adverse events and vaccination, quantifying the risks and benefits, noting the importance of HCW communications with families, and reporting the recommendations of national societies, might increase HCWs' recommendations for HPV vaccination.

Travelers' vaccines and their adverse events in Nara, Japan.

BACKGROUND: It is important to analyze the types of vaccines in travel clinics to determine the focus points in future practice. METHODS: We retrospectively reviewed the electronic medical records of all patients who visited the travel clinic of Nara Medical University between June 2013 and December 2019 to determine their background and the vaccines administered. The information regarding adverse events of the unapproved vaccines in Japan (Havrix®, Verorab®, Boostrix®, Priorix®, Typhim Vi®, and Mencevax®) was also collected. RESULTS: Of 645 patients, 58.6% were men and the median age was 31 years. Business was the most common travel purpose (34.9%), and Southeast Asia was the most common destination (40.2%). More than 80% of travelers to low- and middle-income countries were vaccinated against hepatitis A, while the rabies vaccination rate was approximately 50%. Typhoid vaccination coverage among travelers to South Asia was approximately 50%. The incidence of adverse events requiring medical consultation, telephonic consultation, or prolonged stay in the examination room was less than 5% for all unapproved vaccines in Japan. CONCLUSION: More patient education is needed to increase the vaccination rate of rabies and typhoid vaccines. Adverse events to unapproved vaccines in Japan were not high and were well-tolerated.

Maternal supplementation with Bifidobacterium breve M-16V prevents their offspring from allergic airway inflammation accelerated by the prenatal exposure to an air pollutant aerosol.

Bifidobacterium breve M-16V is a probiotic bacterial strain with efficacy in infants achieved by suppressing T-helper type (Th) 2 immune responses and modulating the systemic Th1/Th2 balance. Exposure to air pollution during pregnancy increases asthma susceptibility in offspring. The aim of this study was to investigate the effects of the maternal intake of B. breve M-16V on susceptibility to asthma accelerated by prenatal exposure to air pollution. The intake of B. breve M-16V in residual oil fly ash (ROFA)-exposed pregnant mice resulted in fewer eosinophils in the bronchoalveolar lavage fluid of neonatal mice and reduced allergic lung inflammation. The expressions of Th2 cytokines including IL-5 and IL-13 were decreased in neonatal mice from ROFA-exposed mothers fed B. breve M-16V. The analysis of fecal microbiota from neonatal mice revealed that the intake of B. breve M-16V by mothers changed the composition of fecal microbiota in neonatal mice, which resulted in a decreased population of Firmicutes. Moreover, several bacterial strains of fecal microbiota from neonatal mice had a strong correlation with Th2 cytokines and histological score. These results suggest that the maternal intake of M-16V might have beneficial effects in neonates by preventing and/or alleviating allergic reactions accelerated by prenatal exposure to air pollution.

Abrogated Caveolin-1 expression via histone modification enzyme Setdb2 regulates brain edema in a mouse model of influenza-associated encephalopathy.

Influenza-associated encephalopathy (IAE) is a serious complication that can follow influenza virus infection. Once a cytokine storm is induced during influenza virus infection, tight junction protein disruption occurs, which consequently leads to blood-brain barrier (BBB) breakdown. However, the details of IAE pathogenesis are not well understood. Here, we established a murine IAE model by administration of lipopolysaccharide following influenza virus infection. Brains from IAE model mice had significantly higher expression of type I interferons and inflammatory cytokines. In addition, the expression of Caveolin-1, one of the key proteins that correlate with protection of the BBB, was significantly lower in brains from the IAE group compared with the control group. We also found that, among 84 different histone modification enzymes, only SET domain bifurcated 2 (Setdb2), one of the histone methyltransferases that methylates the lysine 9 of histone H3, showed significantly higher expression in the IAE group compared with the control group. Furthermore, chromatin immunoprecipitation revealed that methylation of histone H3 lysine 9 was correlated with repression of the Caveolin-1 promoter region. These studies identify Caveolin-1 as a key regulator of BBB permeability in IAE and reveal that it acts through histone modification induced by Setdb2.

Mycobacterium wolinskyi Peritonitis after Peritoneal Catheter Embedment Surgery.

Mycobacterium wolinskyi belongs to the Mycobacterium smegmatis group, which comprises rapidly growing non-tuberculous mycobacteria. The number of case reports on M. wolinskyi infections associated with postoperative wounds has increased in recent years. We herein report a case of peritonitis due to M. wolinskyi after peritoneal catheter embedment surgery. Identification was achieved based on 16S ribosomal RNA and rpoB gene sequencing of the isolate. The patient recovered following catheter removal and treatment with levofloxacin and minocycline for one month.

Risk factors of catheter-related bloodstream infection caused by Bacillus cereus: Case-control study in 8 teaching hospitals in Japan.

In this multicenter, matched case-control study, patients diagnosed with catheter-related bloodstream infection (CRBSI) caused by Bacillus cereus (n = 108) were matched to controls (n = 269). In the multivariable analysis, administration of an amino acid preparation and an indwelling peripheral catheter were significant variables for B cereus-related CRBSI.