International travel is thought to be a major risk factor for developing gastrointestinal illness in England. Transmission is thought to be more likely in countries which have lower food hygiene standards, poorer sanitation, and lack of access to clean water. However, many studies are conducted within travel clinic settings which may bias findings. Here, we present a case–control study undertaken in returning English travellers in the community conducted with cases of gastrointestinal illness notified to UKHSA.

All Cryptosporidiosis, Giardiasis, non-typhoidal Salmonellosis, and Shigellosis cases notified to the UK Health Security Agency (UKHSA) between 01 July 2023 and 15 October 2023 were asked to complete an anonymous electronic questionnaire if travelling during their incubation period. Asymptomatic travellers were recruited as controls via a market research panel and asked to complete the same questionnaire. A destination water, hygiene, and sanitation score were derived from the WHO ‘Attributable fraction of diarrhoea to inadequate WASH’ dataset. Demographics, travel details, and exposures while travelling were compared by Pearson’s chi-squared test, and pathogen and destination specific multivariable analyses were performed using a forward stepwise approach.

A total of 653 cases and 483 controls were included. The odds of being a case were significantly higher when travelling to countries outside of the EU (OR:4.6, 95%CI:3.5–6.0; p = <0.001) and to countries with high-risk WASH score (OR 6.6, 95%CI:4.9–9.1; p = <0.001), particularly Egypt, Mexico, Tunisia, and Turkey. For those travelling to a low-risk destination, eating undercooked meat or fish and swallowing water from environmental water sources were significantly associated with higher odds of illness by multivariable analysis (p < 0.05). At high-risk destinations, eating foods consumed on excursions, swallowing water from environmental sources, and eating foods from hotel buffets were significantly associated with higher odds of being a case.

Travel to popular tourist destinations is a potentially under-recognized risk factor for acquiring gastrointestinal infections. Exposures at low-risk destinations were broadly similar to risk factors in the UK. Exposures in high-risk destinations highlighted potential risks associated with catered hotels and tourist excursions which should be explored further.

This article examines the benefits of utilizing site and orbital diversity reception techniques at Ka- and Q-bands in South Eastern Europe, comparing their performance in Cyprus and Greece. The assessment relies on measured rainfall rate statistics, collected near the selected locations in both countries. The study compares and evaluates the performance of double and triple site and orbital diversity scenarios. The simulation outcome reveals that the adoption of double and triple site, or double and triple orbital diversity configurations leads to considerable enhancements in outage performance in both frequency bands. The delivered improvements are markedly significant when specifically 3-site and 3-orbit diversities are applied, especially at Q-band. However, the orbital diversity demonstrates inferior performance compared with site diversity. Notably, for satellite systems demanding extremely high levels of service continuity, the 3-site diversity approach proves highly effective at Ka- and Q-bands, accomplishing this without necessitating overly large fade margins. Comparing Cyprus and Greece, the latter demonstrates lower outage improvements due to the higher measured rainfall rates. Finally, for a dual orbital diversity scenario in Greece, measured experimental results are presented in terms of joint attenuation and compared with the theoretical model, exhibiting noticeable accuracy.

A well-known theorem of Nikiforov asserts that any graph with a positive $K_{r}$-density contains a logarithmic blowup of $K_r$. In this paper, we explore variants of Nikiforov’s result in the following form. Given $r,t\in \mathbb{N}$, when a positive $K_{r}$-density implies the existence of a significantly larger (with almost linear size) blowup of $K_t$? Our results include:

• • For an $n$-vertex ordered graph $G$ with no induced monotone path $P_{6}$, if its complement $\overline {G}$ has positive triangle density, then $\overline {G}$ contains a biclique of size $\Omega ({n \over {\log n}})$. This strengthens a recent result of Pach and Tomon. For general $k$, let $g(k)$ be the minimum $r\in \mathbb{N}$ such that for any $n$-vertex ordered graph $G$ with no induced monotone $P_{2k}$, if $\overline {G}$ has positive $K_r$-density, then $\overline {G}$ contains a biclique of size $\Omega ({n \over {\log n}})$. Using concentration of measure and the isodiametric inequality on high dimensional spheres, we provide constructions showing that, surprisingly, $g(k)$ grows quadratically. On the other hand, we relate the problem of upper bounding $g(k)$ to a certain Ramsey problem and determine $g(k)$ up to a factor of 2.

• • Any incomparability graph with positive $K_{r}$-density contains a blowup of $K_r$ of size $\Omega ({n \over {\log n}}).$ This confirms a conjecture of Tomon in a stronger form. In doing so, we obtain a strong regularity type lemma for incomparability graphs with no large blowups of a clique, which is of independent interest. We also prove that any $r$-comparability graph with positive $K_{(2h-2)^{r}+1}$-density contains a blowup of $K_h$ of size $\Omega (n)$, where the constant $(2h-2)^{r}+1$ is optimal.

The ${n \over {\log n}}$ size of the blowups in all our results are optimal up to a constant factor.

Georg Lukács’s History and Class Consciousness (1923) has often been criticised for its idealism. I discuss Lukács’s critique of reification in light of these charges, identifying two different idealist vocabularies of (neo-)Kantian and Hegelian origin, respectively. I show that the function of the former is critical: refracting Marx’s analysis of social form through a Kantian form/content distinction allows Lukács to critique capitalism as the domination of form over content. Lukács’s Hegelian leanings are more problematic, however, as they constrain his own insights into the conditioned and contingent character of political practice and history.

In cultural heritage projects and artistic documentation, motion capture has emerged as a key archival strategy that is promised to be a “next stage” solution in preserving and accessing the past. However, motion capture is not an objective recording; it transposes a technological bodily imaginary onto the bodies whose movements it documents. This essay is situated at the intersection of current critical discourses on archives, dance and AI, bringing domain-specific knowledge to reimagine biased algorithmic systems. Although there is substantial risk for representational harms in how current AI motion models are used to render dancing bodies as data, recent projects show that retaining the entanglement of expert practitioners can refine data processing. We argue that incorporating the specificity of dance-based knowledge can support more meaningful historical research practices, in particular when understanding how bodies are themselves also archives. This contributes to identifying and countering the harms that arise from the mismatch between what automated motion extraction systems purport to accomplish and what they actually represent. The article outlines questions and guidelines that reimagine motion data through a visceral approach for an era of AI.

Online synchronous chat, or ‘Live Chat’, is distinguished by its real-time, anonymous, and text-based nature. There is limited understanding of the characteristics of those who choose Live Chat services compared to Blended Services. This study examined the demographic, psychosocial, and service engagement profiles of young people using the Irish Live Chat service, Jigsaw Live Chat, compared with those attending Jigsaw’s Blended (in-person and/or video) support Service. Routine service-based data were analysed from 1,313 Live Chat and 3,604 Blended Service users. Reasons for attendance among Live Chat users seeking mental health support were analysed using content analysis. Live Chat users were more likely to be gender-diverse, older, and to report higher psychological distress than Blended Service users. Anxiety and low mood were common presenting issues. Attendance reasons varied, with over one-third citing multiple issues and many experiencing persistent distress. A minority attended for information or while waiting for other support. Overall, users reported high satisfaction. Live Chat users waited an average of 2.5 minutes, compared with typical waits of 1–2 months for the Blended Service. These findings highlight Live Chat as a distinct and essential access point for highly distressed and underserved youth, particularly those with minority gender and sexual identities.

In this paper, a dual concentric square-loop dual-polarized reconfigurable frequency selective surface with a high tuning ratio of 2.02 operating in the 1.53–3.10 GHz band is proposed. This high tuning ratio has been achieved by using four SMV1430-LF varactor diodes, which have been actuated using a simple biasing arrangement made of stubs and four metallic vias per unit-cell. The unit-cell has been rigorously analyzed, and an equivalent circuit (EC) model has been developed for the physical insight. The proposed EC model also demonstrates the reconfigurability of the unit-cell and thus predicts its behavior. The effect of the angular incidence of the impinging electromagnetic wave on the structure up to a 45º has been experimentally verified, which demonstrates its angular stability and polarization insensitive behavior. The structure may find applications in the electromagnetic spectrum’s L, S, and 2.45 GHz ISM bands.

The consensus view in the growth literature is that R&D scale effects are absent in mature industrialized economies but may be present in emerging economies undergoing transition. Scale effects imply a proportional relationship between a stationary $I(0)$ regressand (growth rates of real per capita GDP and/or TFP) and a non-stationary $I(1)$ regressor (the scale of R&D), which gives rise to the problem of unbalanced regression and spurious parameter estimates. This issue has not been adequately addressed in the existing literature. Furthermore, emerging economies have received relatively little attention in this context. We address these issues by (i) accurately measuring R&D scale and (ii) adopting an appropriate econometric specification and estimator. We find significant scale effects in a panel of emerging countries, but not in developed countries. We propose an endogenous growth model that captures these properties—presence of scale effects during growth transitions, but not at the long-run equilibrium—thereby reconciling our results. Our model predicts that the long-run growth rates of per capita real GDP and TFP are driven by the growth rates of technological innovation and aggregate employment—although, in the case of emerging economies, only technological innovation significantly contributes to TFP growth.

Over centuries and across continents, authoritarian governments have demonstrated a large appetite for international cooperation to target political opponents across borders. In 1851, the “first modern police organization”—the Police Union of German States, whose members included Austria and Prussia—was established “with the express purpose of policing the political opposition of established autocratic regimes.”1 During the 1970s and early 1980s, military regimes in South America participated in a secret scheme known as Operation Condor to coordinate their efforts to suppress subversion.2 A recent analysis of twenty-nine “hard authoritarian” regional organizations found that twenty-five were engaged in police cooperation.3 The Shanghai Cooperation Organization (SCO) is an example. Its member states have agreed to jointly fight the “three evils” of terrorism, separatism, and extremism.4 Following a 2009 demonstration that led to riots in Urumqi, Xinjiang, some organizers fled abroad; at China’s behest, SCO members Kyrgyzstan and Kazakhstan detained and then extradited them back to China.5