BackgroundThe ability to withstand thermal stress is considered to be of crucial importance for individual fitness and species' survival. Thus, organisms need to employ effective mechanisms to ensure survival under stressful thermal conditions, among which phenotypic plasticity is considered a particularly quick and effective one.Methodology/Principal FindingsIn a series of experiments we here investigate phenotypic adjustment in temperature stress resistance following environmental manipulations in the butterfly Bicyclus anynana. Cooler compared to warmer acclimation temperatures generally increased cold but decreased heat stress resistance and vice versa. In contrast, short-time hardening responses revealed more complex patterns, with, e.g., cold stress resistance being highest at intermediate hardening temperatures. Adult food stress had a negative effect on heat but not on cold stress resistance. Additionally, larval feeding treatment showed interactive effects with adult feeding for heat but not for cold stress resistance, indicating that nitrogenous larval resources may set an upper limit to performance under heat stress. In contrast to expectations, cold resistance slightly increased during the first eight days of adult life. Light cycle had marginal effects on temperature stress resistance only, with cold resistance tending to be higher during daytime and thus active periods.Conclusions/SignificanceOur results highlight that temperature-induced plasticity provides an effective tool to quickly and strongly modulate temperature stress resistance, and that such responses are readily reversible. However, resistance traits are not only affected by ambient temperature, but also by, e.g., food availability and age, making their measurement challenging. The latter effects are largely underexplored and deserve more future attention. Owing to their magnitude, plastic responses in thermal tolerance should be incorporated into models trying to forecast effects of global change on extant biodiversity.

Key PointsQuestionAmong extremely preterm infants born at US academic medical centers between 2013 and 2018, what were mortality, in-hospital morbidity, and 2-year neurodevelopmental outcomes?FindingsIn this observational study based on a prospective registry of 10 877 infants born at 22-28 weeks’ gestational age in 2013-2018 in 19 US academic medical centers, survival to discharge occurred in 78.3% and was significantly improved compared with a historical rate of 76.0% among infants born in 2008-2012. Among infants born at less than 27 weeks’ gestational age who survived to follow-up assessment at 2 years, 49.9% had been rehospitalized and severe neurodevelopmental impairment occurred in 21.2%.MeaningAmong extremely preterm infants born at US academic medical centers from 2013 to 2018, survival to discharge significantly improved compared with infants born in 2008-2012, but among those born at less than 27 weeks’ gestational age, rehospitalization and neurodevelopmental impairment at 2 years were common.

prenatal care, if it is available at your institution, expanding it to individuals with diabetes in pregnancy should be considered. One issue is the efficiency of the model, and although some have been able to see the same number of patients in both models, other institutions have not, so continued work on refining the group model is imperative. Meanwhile, we await larger studies of this approach in this population to ascertain what the real health benefits may be.-ABC)

Epstein–Barr Virus (EBV) is a gamma-herpes virus that infects 90% of humans without any symptoms in most cases, but has an oncogenic potential, especially in immunocompromised individuals. In the past 30 years, several primary immunodeficiencies (PIDs) associated with a high risk to develop EBV-associated lymphoproliferative disorders (LPDs), essentially consisting of virus-associated hemophagocytic syndrome, non-malignant and malignant B-cell LPDs including non-Hodgkin and Hodgkin’s types of B lymphomas have been characterized. Among them are SH2D1A (SAP), XIAP, ITK, MAGT1, CD27, CD70, CTPS1, RASGRP1, and CORO1A deficiencies. Penetrance of EBV infection ranges from 50 to 100% in those PIDs. Description of large cohorts and case reports has refined the specific phenotypes associated with these PIDs helping to the diagnosis. Specific pathways required for protective immunity to EBV have emerged from studies of these PIDs. SLAM-associated protein-dependent SLAM receptors and MAGT1-dependent NKG2D pathways are important for T and NK-cell cytotoxicity toward EBV-infected B-cells, while CD27–CD70 interactions are critical to drive the expansion of EBV-specific T-cells. CTPS1 and RASGRP1 deficiencies further strengthen that T-lymphocyte expansion is a key step in the immune response to EBV. These pathways appear to be also important for the anti-tumoral immune surveillance of abnormal B cells. Monogenic PIDs should be thus considered in case of any EBV-associated LPDs.