Factors associated with Coronavirus disease 2019 (COVID-19) and an assessment of adherence to infection prevention and control (IPC) guidelines among health workers —Nakonde District, Zambia, 2020

Introduction: Health workers play a critical role in the clinical management of COVID-19 patients. However, research on their infection risk and clinical characteristics, particularly in Africa, is emerging. We investigated risk factors for COVID-19 infection and assessed adherence to infection prevention and control (IPC) guidelines among health workers in Nakonde District. Methods: A case-control study among health workers at Nakonde Urban Health Centre and Nakonde District Hospital was conducted from 15 to 25 May 2020. A standardized questionnaire covering demographic information; possible exposure to persons with COVID-19; adherence to infection prevention and control measures was administered to all health workers present at these facilities. Descriptive statistics were performed and logistic regression was used to calculate the odds ratio (OR) and 95% CIs. Results: A total of 197 HCWs are deployed in the two facilities out of which we obtained 138 responses. Seventy-five (54%) had complete responses that were analyzed in this study. Among the 75, 54 (72%) were female. The median age for all the HCWs that responded was 30 years (IQR 26-33). Thirty-seven (49%) were laboratory-confirmed COVID-19 cases. Symptoms that were exhibited among HCWs with COVID-19 included cough (49%), headache (43%), runny nose (32%) and fatigue (18%); fever was rarely reported (8%). Cough was associated with being a case of COVID-19 (OR 4.2 95% CI 1.5-11.9). Coexisting conditions were similar among the cases and controls. There were no statistically significant differences in exposures between HCWs with confirmed COVID-19 and those without (OR 0.96; 95% CI 0.4-2.5). The WHO five moments of hand hygiene recommended for health workers were practiced by (64%). Non availability of Personal Protective Equipment was reported by 70% of HCWs and this was similar among the cases of COVID-19 and the non-cases. Conclusion: Given the critical role HCWs play in looking after the sick, continued protection of this population at work, at home, and in the community through surveillance should be a national priority

Photopolymerizable nanocomposite photonic materials and their holographic applications in light and neutron optics

We present an overview of recent investigations of photopolymerizable nanocomposite photonic materials in which, thanks to their high degree of material selectivity, recorded volume gratings possess high refractive index modulation amplitude and high mechanical/thermal stability at the same time, providing versatile applications in light and neutron optics. We discuss the mechanism of grating formation in holographically exposed nanocomposite materials, based on a model of the photopolymerization-driven mutual diffusion of monomer and nanoparticles. Experimental inspection of the recorded gratings morphology by various physicochemical and optical methods is described. We then outline the holographic recording properties of volume gratings recorded in photopolymerizable nanocomposite materials consisting of inorganic/organic nanoparticles and monomers having various photopolymerization mechanisms. Finally, we show two examples of our holographic applications, holographic digital data storage and slow-neutron beam control.(VLID)286369

The Insula of Reil Revisited: Multiarchitectonic Organization in Macaque Monkeys

The insula of Reil represents a large cortical territory buried in the depth of the lateral sulcus and subdivided into 3 major cytoarchitectonic domains: agranular, dysgranular, and granular. The present study aimed at reinvestigating the architectonic organization of the monkey's insula using multiple immunohistochemical stainings (parvalbumin, PV; nonphosphorylated neurofilament protein, with SMI-32; acetylcholinesterase, AChE) in addition to Nissl and myelin. According to changes in density and laminar distributions of the neurochemical markers, several zones were defined and related to 8 cytoarchitectonic subdivisions (Ia1–Ia2/Id1–Id3/Ig1–Ig2/G). Comparison of the different patterns of staining on unfolded maps of the insula revealed: 1) parallel ventral to dorsal gradients of increasing myelin, PV- and AChE-containing fibers in middle layers, and of SMI-32 pyramidal neurons in supragranular layers, with merging of dorsal and ventral high-density bands in posterior insula, 2) definition of an insula “proper” restricted to two-thirds of the “morphological” insula (as bounded by the limiting sulcus) and characterized most notably by lower PV, and 3) the insula proper is bordered along its dorsal, posterodorsal, and posteroventral margin by a strip of cortex extending beyond the limits of the morphological insula and continuous architectonically with frontoparietal and temporal opercular areas related to gustatory, somatosensory, and auditory modalities

Confirmation of functional zones within the human subthalamic nucleus: Patterns of connectivity and sub-parcellation using diffusion weighted imaging

The subthalamic nucleus (STN) is a small, glutamatergic nucleus situated in the diencephalon. A critical component of normal motor function, it has become a key target for deep brain stimulation in the treatment of Parkinson's disease. Animal studies have demonstrated the existence of three functional sub-zones but these have never been shown conclusively in humans. In this work, a data driven method with diffusion weighted imaging demonstrated that three distinct clusters exist within the human STN based on brain connectivity profiles. The STN was successfully sub-parcellated into these regions, demonstrating good correspondence with that described in the animal literature. The local connectivity of each sub-region supported the hypothesis of bilateral limbic, associative and motor regions occupying the anterior, mid and posterior portions of the nucleus respectively. This study is the first to achieve in-vivo, non-invasive anatomical parcellation of the human STN into three anatomical zones within normal diagnostic scan times, which has important future implications for deep brain stimulation surgery