Angiotensin-converting enzyme 2 (ACE2) is the cellular receptor for SARS coronavirus (SARS-CoV) and the new coronavirus (SARS-CoV-2) that is causing the serious epidemic COVID-19. Here we present cryo-EM structures of full-length human ACE2, in the presence of a neutral amino acid transporter B0AT1, with or without the receptor binding domain (RBD) of the surface spike glycoprotein (S protein) of SARS-CoV-2, both at an overall resolution of 2.9 Å, with a local resolution of 3.5 Å at the ACE2-RBD interface. The ACE2-B0AT1 complex is assembled as a dimer of heterodimers, with the Collectrin-like domain (CLD) of ACE2 mediating homo-dimerization. The RBD is recognized by the extracellular peptidase domain (PD) of ACE2 mainly through polar residues. These findings provide important insights to the molecular basis for coronavirus recognition and infection. Copyright © 2020, American Association for the Advancement of Science.Occupational stress is an emerging problem among physician and nurses, and those working in intensive care settings are particularly exposed to the risk of developing burnout. To verify what types of interventions to manage occupational stress and burn out within neonatal intensive care units (NICUs) have been introduced so far and to verify their efficacy among caregivers. PsycINFO (PsycINFO 1967-July week 3 2019), Embase (Embase 1996-2019 week 29) e Medline (Ovid MEDLINE(R) without revisions 1996-July week 2 2019) were systematically searched combining MeSH and free text terms for “burn out” AND “healthcare provider” AND “NICU”. Inclusion criteria were interventions directed to healthcare providers settled in NICUs. Only English language papers were included. Six articles were included in the final analysis. All the studies reported an overall efficacy of the interventions in reducing work-related stress, both when individual focused and organisation directed. The analysis revealed low quality of the studies and high heterogeneity in terms of study design, included populations, interventions and their evaluation assessment. There is currently very limited evidence regarding the management of occupational stress and burn out within NICUs. The quality of available studies was suboptimal. The peculiarities of the NICUs should be considered when developing strategies for occupational stress management. Training self-awareness of workers regarding their reactions to the NICU environment, also from the pre-employment stage, could be an additional approach to prevent and manage stress. © Author(s) (or their employer(s)) 2020. No commercial re-use. See rights and permissions. Published by BMJ.OBJECTIVES Four machine manufacturing facility workers had a novel occupational lung disease of uncertain aetiology characterised by lymphocytic bronchiolitis, alveolar ductitis and emphysema (BADE). We aimed to evaluate current workers’ respiratory health in relation to job category and relative exposure to endotoxin, which is aerosolised from in-use metalworking fluid. METHODS We offered a questionnaire and spirometry at baseline and 3.5 year follow-up. Endotoxin exposures were quantified for 16 production and non-production job groups. Forced expiratory volume in one second (FEV1) decline ≥10% was considered excessive. We examined SMRs compared with US adults, adjusted prevalence ratios (aPRs) for health outcomes by endotoxin exposure tertiles and predictors of excessive FEV1 decline. RESULTS Among 388 (89%) baseline participants, SMRs were elevated for wheeze (2.5 (95% CI 2.1 to 3.0)), but not obstruction (0.5 (95% CI 0.3 to 1.1)). Mean endotoxin exposures (range 0.09-28.4 EU/m3) were highest for machine shop jobs. MELK-8a mouse Higher exposure was associated with exertional dyspnea (aPR=2.8 (95% CI 1.4 to 5.7)), but not lung function. Of 250 (64%) follow-up participants, 11 (4%) had excessive FEV1 decline (range 403-2074 mL); 10 worked in production. Wheeze (aPR=3.6 (95% CI 1.1 to 12.1)) and medium (1.3-7.5 EU/m3) endotoxin exposure (aPR=10.5 (95% CI 1.3 to 83.1)) at baseline were associated with excessive decline. One production worker with excessive decline had BADE on subsequent lung biopsy. CONCLUSIONS Lung function loss and BADE were associated with production work. Relationships with relative endotoxin exposure indicate work-related adverse respiratory health outcomes beyond the sentinel disease cluster, including an incident BADE case. Until causative factors and effective preventive strategies for BADE are determined, exposure minimisation and medical surveillance of affected workforces are recommended. © Author(s) (or their employer(s)) 2020. No commercial re-use. See rights and permissions. Published by BMJ.Leishmaniases are neglected tropical diseases. The treatment of leishmaniasis relies exclusively on chemotherapy including amphotericin B (AmB), miltefosine (hexadecylphosphocholine), and pentamidine. Besides the fact that these molecules are harmful for patients, little is known about the impact of such antileishmanial drugs on primary human cells in relation to immune function. The present study demonstrates that all antileishmanial drugs inhibit CD4 and CD8 T cell proliferation at the doses that are not related to increased cell death. Our results highlight that antileishmanial drugs have an impact on monocytes by altering the expression of IL-12 induced by LPS, whereas only AmB induced IL-10 secretion; both cytokines are essential in regulating Th1 cell-mediated immunity. Interestingly, IL-12 and anti-IL-10 Abs improved T cell proliferation inhibited by AmB. Furthermore, our results show that in contrast to hexadecylphosphocholine and pentamidine, AmB induced gene expression of the inflammasome pathway. Thus, AmB induced IL-1β and IL-18 secretions, which are reduced by specific inhibitors of caspase activation (Q-VD) and NLRP3 activation (MCC950). Our results reveal previously underestimated effects of antileishmanial drugs on primary human cells. Copyright © 2020 by The American Association of Immunologists, Inc.The Flavivirus E protein induces protective immunity, and its Abs cause serious problems for serodiagnosis because of the difficulty in differentiating cross-reactive Abs. Moreover, cross-reactive Abs may increase disease severity after secondary Flavivirus infections via Ab-dependent enhancement. Cross-reactive epitopes are therefore critical for understanding serodiagnosis and improving the general knowledge of Flavivirus infections. A minimal epitope, 227GSSAGTWQN235, was identified by a neutralizing mAb 1G2 against duck Tembusu virus (DTMUV), which recognized only monomer E protein under nonreducing conditions. It was unexpectedly found that mutations in the epitope residues G231 or W233 completely abolished reactivity to 1G2 and sera from mice infected with Japanese encephalitis virus, West Nile virus, and Zika virus. An immunofluorescence assay confirmed that mAb 1G2 could cross-react with the E proteins from Japanese encephalitis virus, West Nile virus, and Zika virus. Protein and virus modeling revealed that the epitope was surface accessible in the mature virus and located in the hi loop of domain II.