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To assess preparedness for Candida auris in Canadian hospitals.
Design:
Cross-sectional survey.
Setting:
Canadian Nosocomial Infection Surveillance Program (CNISP) hospitals.
Methods:
In June 2024, surveys were e-mailed to the infection prevention and control departments of 109 CNISP hospitals and their 33 microbiology laboratories. The surveys assessed policies for patient screening/management and laboratory processes supporting C. auris transmission prevention. Results were compared to a similar 2018 survey.
Results:
All 109 hospitals and 32/33 laboratories responded. Most hospitals had policies for admission screening (80%, 87/109) and policies/defined plans for post-exposure screening (95%, 104/109). Policy presence increased from 18% to 73% in 56 hospitals completing both 2018 and 2024 surveys (P < 0.001). Among hospitals with admission screening policies, 69% (60/87) screened for recent out-of-country hospitalization. All but one hospital implemented transmission-based precautions for cases; 70% (76/109) continued precautions indefinitely. Overall, 94% (99/105; excluding hospitals with exclusively private rooms) and 55% (60/109) of hospitals screened roommates and wardmates, respectively. Frequency and timing of screening and policies regarding precautions for exposed patients varied. All hospitals used axilla and groin swabs, at minimum, for screening. Most (81%, 26/32) laboratories identified all clinically significant Candida isolates to species level, increasing from 48% to 85% (P < 0.001) in the 27 laboratories completing both 2018 and 2024 surveys. Twenty-four laboratories (75%) had standard operating procedures for processing screening specimens; 96% (23/24) used direct plating onto chromogenic agar.
Conclusions:
Despite progress in C. auris preparedness, areas for improvement remain. Variability in practice may be related to evidence gaps and resource constraints.
Although potential links between oxytocin (OT), vasopressin (AVP), and social cognition are well-grounded theoretically, most studies have included all male samples, and few have demonstrated consistent effects of either neuropeptide on mentalizing (i.e. understanding the mental states of others). To understand the potential of either neuropeptide as a pharmacological treatment for individuals with impairments in social cognition, it is important to demonstrate the beneficial effects of OT and AVP on mentalizing in healthy individuals.
Methods
In the present randomized, double-blind, placebo-controlled study (n = 186) of healthy individuals, we examined the effects of OT and AVP administration on behavioral responses and neural activity in response to a mentalizing task.
Results
Relative to placebo, neither drug showed an effect on task reaction time or accuracy, nor on whole-brain neural activation or functional connectivity observed within brain networks associated with mentalizing. Exploratory analyses included several variables previously shown to moderate OT's effects on social processes (e.g., self-reported empathy, alexithymia) but resulted in no significant interaction effects.
Conclusions
Results add to a growing literature demonstrating that intranasal administration of OT and AVP may have a more limited effect on social cognition, at both the behavioral and neural level, than initially assumed. Randomized controlled trial registrations: ClinicalTrials.gov; NCT02393443; NCT02393456; NCT02394054.
In this chapter we treat several different applications of cut and paste surgery. The general principle is to paste together dynamics of different maps, under the condition that they agree on the boundaries of their distinct domains of definition.
Section 7.1 explains one of the earliest uses of quasiconformal mappings in holomorphic dynamics, due to Douady and Hubbard. It is especially relevant as a building block in many other applications. This celebrated result justifies why polynomial Julia sets appear in the dynamical plane of many non-polynomial families. The parameter version of the Straightening Theorem explains why one can also find copies of the Mandelbrot set in parameter spaces other than that of the quadratic family.
Section 7.2 groups several classical results about Siegel discs under one common surgery, due to Ghys. The construction consists in pasting a rigid irrational rotation on a topological disc bounded by an invariant quasicircle: the gluing curve. With this construction one shows, for example, that a Siegel disc of a quadratic polynomial with rotation number of bounded type is a Jordan domain containing the critical point on the boundary.
Section 7.3 is dedicated to a construction due to Shishikura, where two rational maps with Siegel discs of a given rotation number are pasted together along an invariant curve, resulting in a map with a Herman ring of the same rotation number. This construction explains, for example, the possible classes of irrational numbers that can be realized as rotation numbers of actual Herman rings.
Single GaN quantum wells in the nearly lattice-matched GaN/Al1−xInxN system have been studied using photoluminescence (PL) and PL excitation (PLE) spectroscopy. The structures were grown on free-standing GaN and sapphire substrates. Selectively excited PL is able to distinguish luminescence originating from the wells, barriers and the underlying GaN buffer layers. The PL spectra show that the quantum well transition energy decreases as the well-width increases. This manifestation of the quantum confined Stark effect (QCSE) results from intense spontaneous polarization fields, which are present even in the absence of strain in the QW layer. Power dependent PL measurements provide information on the screening of the internal fields. PLE data provide an estimation of the band gap and enable one to determine the energy shift between emission and absorption in the Al1−xInxN barriers.
We apply Thurston's characterization of postcritically finite rationalmaps as branched coverings of the sphere to give new classes ofcombination theorems for postcritically finite rational maps. Ourconstructions increase the degree of the map but always yield branchedcoverings which are equivalent to rational maps, independent of thecombinatorics of the original map. The main tool is a general theorembased on the intersection number of arcs and curves which controlsthe region in the sphere in which an obstruction may reside.
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